It depends who you want to get. I also have a Sportscollectors account, but they don't tell all of the addresses. I put together TTM most of the 1970 Brewers, and am working on the 57 Braves now. Some players have only had a handful of requests via what was posted on SportsCollectors. I only go for higher return rates as I only send OMLB's. Sometimes I send a letter first asking if they are willing to sign. My best returns are HOFers... Billy Williams, Feller, Sparky Anderson, Dick Williams, Doerr, Fingers, Perry, Kaline, Snider, etc. My best active player would be Mariano Rivera.