Which Edelbrock rebuild kit?

I just tore apart my 1406 Edelbrock that I got from another Chevy friend LOL for free LOL. most of time I've just had to clean them up and run them. This one is exceptionally gonkey and gross. The local parts store, Summit, and places like that want about 40 to $43. But online on eBay and places like that I've see them for anywhere from 11 or $12 up to $25? are these cheaper ones? just knockoff versions that are going to cause me problems? Or is it just a brick-and-mortar versus the internet? Thank you for anybody's experiences...