I guess that you can't buy these loose?
Sometimes they will appear on fleabay loose so check there and see what you can find.
A standard cooler is fine for stock use of course, any kind of OC'ing use requires a better cooler and there are a few out there. Thermaltake made the Volcano series and those are OK for that use, personally I have two Volcano 11's I bought new and they work well.
Not selling them because I know the entire history of them and they do work, also because they are a matching set for my Asus A7M-266D dualie setup.
Check for anything of that series, sually the later ones of a higher model numerically are what to go for since those are later releases and being they are newer, there is a better chance they'll be in good shape to use.