Assembling a “Back-Up” Coin Collection

I’ve recently had a few collectors ask me a similar question; one that has given me some pause to think. Basically, these are people whose main collecting focus is an expensive, very challenging series. Due to lack of availability (of funds), their purchases may be very infrequent. But they still love coins and the thrill of the hunt. What, they’ve asked me, can they play with as their “back-up” set?   
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