yes, you are correct... this one i found on newegg, where you can't obviously buy from, but it has quite a bit higher specs(should be around 2.4-2.8 for the amd 64 3000+) than 1-1.5 and it's $150... you can get some as low as $50, but those hover around the 1.0 ghz range
so, you buy those and you have the mobo/cpu together, so you'll need ram, case, hdd, and prolly cd to install, then do have small ones for small cases, not sure on price...