Don't let this discourage you but Oslo is very expensive. Norway is beautiful in many ways and worth the trip. As usual bring money.
Worlds most expensive cities (CNN Money.com).
<TABLE cellSpacing=2 cellPadding=3 width="100%" border=0><TBODY><TR class=chartcolor1><TD class=tease style="FONT-WEIGHT: bold" align=middle>1</TD><TD class=tease>Tokyo, Japan</TD></TR><TR class=chartcolor2><TD class=tease style="FONT-WEIGHT: bold" align=middle>2</TD><TD class=tease>London, UK</TD></TR><TR class=chartcolor1><TD class=tease style="FONT-WEIGHT: bold" align=middle>3</TD><TD class=tease>Moscow, Russia</TD></TR><TR class=chartcolor2><TD class=tease style="FONT-WEIGHT: bold" align=middle>4</TD><TD class=tease>Osaka, Japan</TD></TR><TR class=chartcolor1><TD class=tease style="FONT-WEIGHT: bold" align=middle>5</TD><TD class=tease>Hong Kong</TD></TR><TR class=chartcolor2><TD class=tease style="FONT-WEIGHT: bold" align=middle>6</TD><TD class=tease>Geneva, Switzerland</TD></TR><TR class=chartcolor1><TD class=tease style="FONT-WEIGHT: bold" align=middle>7</TD><TD class=tease>Seoul, South Korea</TD></TR><TR class=chartcolor2><TD class=tease style="FONT-WEIGHT: bold" align=middle>8</TD><TD class=tease>Copenhagen, Denmark</TD></TR><TR class=chartcolor1><TD class=tease style="FONT-WEIGHT: bold" align=middle>9</TD><TD class=tease>Zürich, Switzerland</TD></TR><TR class=chartcolor2><TD class=tease style="FONT-WEIGHT: bold" align=middle>10</TD><TD class=tease>St. Petersburg, Russia</TD></TR><TR class=chartcolor1><TD class=tease style="FONT-WEIGHT: bold" align=middle>11</TD><TD class=tease>Beijing, China</TD></TR><TR class=chartcolor2><TD class=tease style="FONT-WEIGHT: bold" align=middle>12</TD><TD class=tease>New York City, USA</TD></TR><TR class=chartcolor1><TD class=tease style="FONT-WEIGHT: bold" align=middle>13</TD><TD class=tease>Milan, Italy</TD></TR><TR class=chartcolor2><TD class=tease style="FONT-WEIGHT: bold" align=middle>14</TD><TD class=tease>Dublin, Ireland</TD></TR><TR class=chartcolor1><TD class=tease style="FONT-WEIGHT: bold" align=middle>15</TD><TD class=tease>Oslo, Norway</TD></TR><TR class=chartcolor2><TD class=tease style="FONT-WEIGHT: bold" align=middle>16</TD><TD class=tease>Shanghai, China</TD></TR><TR class=chartcolor1><TD class=tease style="FONT-WEIGHT: bold" align=middle>17</TD><TD class=tease>Paris, France</TD></TR><TR class=chartcolor2><TD class=tease style="FONT-WEIGHT: bold" align=middle>18</TD><TD class=tease>Istanbul, Turkey</TD></TR><TR class=chartcolor1><TD class=tease style="FONT-WEIGHT: bold" align=middle>19</TD><TD class=tease>Vienna, Austria</TD></TR><TR class=chartcolor2><TD class=tease style="FONT-WEIGHT: bold" align=middle>20</TD><TD class=tease>Sydney, Australia</TD></TR><TR class=chartcolor1><TD class=tease style="FONT-WEIGHT: bold" align=middle>21</TD><TD class=tease>Rome, Italy</TD></TR><TR class=chartcolor2><TD class=tease style="FONT-WEIGHT: bold" align=middle>22</TD><TD class=tease>Stockholm, Sweden</TD></TR><TR class=chartcolor1><TD class=tease style="FONT-WEIGHT: bold" align=middle>23</TD><TD class=tease>Helsinki, Finland</TD></TR><TR class=chartcolor2><TD class=tease style="FONT-WEIGHT: bold" align=middle>24</TD><TD class=tease>Abidjan, Ivory Coast</TD></TR><TR class=chartcolor1><TD class=tease style="FONT-WEIGHT: bold" align=middle>25</TD><TD class=tease>Douala, Cameroon</TD></TR><TR class=chartcolor2><TD class=tease style="FONT-WEIGHT: bold" align=middle>26</TD><TD class=tease>Amsterdam, Netherlands</TD></TR><TR class=chartcolor1><TD class=tease style="FONT-WEIGHT: bold" align=middle>27</TD><TD class=tease>Los Angeles, USA</TD></TR><TR class=chartcolor2><TD class=tease style="FONT-WEIGHT: bold" align=middle>28</TD><TD class=tease>Berlin, Germany</TD></TR><TR class=chartcolor1><TD class=tease style="FONT-WEIGHT: bold" align=middle>29</TD><TD class=tease>Hanoi, Vietnam</TD></TR><TR class=chartcolor2><TD class=tease style="FONT-WEIGHT: bold" align=middle>30</TD><TD class=tease>Shenzhen, China</TD></TR><TR class=chartcolor1><TD class=tease style="FONT-WEIGHT: bold" align=middle>31</TD><TD class=tease>Taipei, Taiwan</TD></TR><TR class=chartcolor2><TD class=tease style="FONT-WEIGHT: bold" align=middle>32</TD><TD class=tease>Guangzhou, China</TD></TR><TR class=chartcolor1><TD class=tease style="FONT-WEIGHT: bold" align=middle>33</TD><TD class=tease>Tel Aviv, Israel</TD></TR><TR class=chartcolor2><TD class=tease style="FONT-WEIGHT: bold" align=middle>34</TD><TD class=tease>Budapest, Hungary</TD></TR><TR class=chartcolor1><TD class=tease style="FONT-WEIGHT: bold" align=middle>35</TD><TD class=tease>Chicago, USA</TD></TR><TR class=chartcolor2><TD class=tease style="FONT-WEIGHT: bold" align=middle>36</TD><TD class=tease>Ho Chi Minh City, Vietnam</TD></TR><TR class=chartcolor1><TD class=tease style="FONT-WEIGHT: bold" align=middle>37</TD><TD class=tease>Beirut, Lebanon</TD></TR><TR class=chartcolor2><TD class=tease style="FONT-WEIGHT: bold" align=middle>38</TD><TD class=tease>San Francisco, USA</TD></TR><TR class=chartcolor1><TD class=tease style="FONT-WEIGHT: bold" align=middle>39</TD><TD class=tease>Luxembourg</TD></TR><TR class=chartcolor2><TD class=tease style="FONT-WEIGHT: bold" align=middle>40</TD><TD class=tease>Düsseldorf, Germany</TD></TR></TBODY></TABLE>