Originally Posted by SkyDog75

Specifically what kind of bike do you have? Make/model/year? Framesets (frame and fork together) are available, but there are at least a few different standards for certain parts like bottom brackets and headsets and some frames will be more compatible with your current parts than others. [...] There are plenty more sources for frames and framesets, especially if you're looking for high-end bikes. But another possibility on the budget end of the spectrum is to find a used 'donor' bikes. Used bikes, even some pretty nice ones, can often be found for less than the price of a new frame.