Yes, but it will probably cost almost as much as you paid for the scope:
here is one:
http://www.amazon.com/Celestron-Erect-Refractor-Schmidt-Cassegrain/dp/B0000665V4/ref=sr_1_2?ie=UTF8&s=electronics&qid=1283197941&sr=8-2
All astronomical telescopes show upside down images, it's normal. The erecting diagonal is only used for terrestrial day time viewing, of land objects.
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