ScraperRick 
To the original poster, I hate to say it, but everyone here is right, you are not going to make money buying cats without a large bankroll. I myself am a core buyer, I buy from garages, dealerships and scrapyards. Im all for anyone going out to earn a living, trust me there is enough to go around for everyone, but the simple fact is garages are not going to sell you their cats for a few bucks. Right now I am paying $128 for GM's to my garage customers, I make $5 a cat, the only way to make money is volume, and it takes a bankroll. The core market is highly competetive, for everything I buy (batteries, starters, alternators, keyless remotes, engines, etc) I pay more than the scrapyard would if the business brought it in themselves. So, in all honesty, for you to buy it and bring it to a scrapyard is a tough sell, for example, I'm paying $12-13 each for auto batteries from garages, thats about .36 cents a lb, 90% of scrapyards don't even pay that at their door, while I am picking it up. If you want to try and get in this business, establish a bankroll first, learn your material... specifically the foreign catergories, domestics are easy, but first and foremost learn how to spot an aftermarket, eliminate your chances of getting burned. Always educate your customers, do not tell them a cat is an aftermarket to try and make a quick buck, set your profit margin and pay accordingly, repeat business is the name of the game, and loyalty means absoultely nothing in this game when you come to the door with cash.
Bookmarks