If you're going for a master back run, I think you just want to always be looking, and always have the funds available to be able to quickly go after it when a scarce back comes along. My approach with t206 has always been: there are so many cards I need, that I don't need to search for any one card in particular, and I don't need to overpay for any one card. You will have to make strong offers for the rare backs when they hit the market, but I wouldn't go out of your way looking for the common backs. Over time, you'll get them all via ebay auctions at prices you're happy with. No need to overpay for them right now. I agree with Jantz that getting a nice Dahlen would be a pretty cool way to start, especially if you can get a tougher back like a Sovereign. Good luck!
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