You could try rooting it.
Appslib is a tablet equivalent to the Market.You can also download a .apk to your SD card and load it from there.
What tablet do you have?
Broop
http://www.androidtablets.net/forum/creative-tablets/Check there. It's helped me before.
ApplicationsWorkingBestTubeAdobe ReaderAndromaxAstroFacebookOpera MiniSkyfireADW Launcher
Unfortunetly that root, as said in the thread, isn't a 100% working way.
Well, I'll keep looking for a root. But yes, there is no way to get the market without rooting. EDIT: It pretty much appears that it's the only method.