JIM
Keep an eye on e8ay. They are on there all the time. THey usually go cheap enough that you buy the whole bow. Watch for 76'er, Minute Man, and other names of the same style Bear Takedown. Pretty much all the limbs and risers work together.
One trick we use to get good deals on Bear Custom takedown limbs is to watch for the mag risers in crappy shape, lefties, etc... All the limbs are interchangeable and sometimes you can pick up the whole bow cheaper than you can pick up a set of limbs. The regular takedown limbs will not work on a 76'er but you get the concept that I am talking about.