Hi, im wondering where i can find a list of places that i can buy beamspring keyboards on.
The most common place is Ebay. Just type in "IBM Beamspring" or the specific model you're looking for (i.e. "IBM 5251"). Alternatively you could post a want to buy in the classifieds and see what kind of offers you get. The price will be highly dependent on the specific model and overall condition. I would recommend posting a WTB first because you will be able to get full disclosure about the condition. If you buy a dirty one off Ebay you may end up paying a lot of money for a board with condition issues.
Now is a good time to buy as it seems the lack of Xwhatsit controllers has reduced demand and there are two substitute products on the horizon (MX Silo and the low profile design on Deskthority). IMO these substitutes will likely be quite different and less refined compared the the original beamspring but I will reserve judgement until after I've tried them.