Buy/Sell/Trade Forum

Can't recommend SCN enough if you really enjoy TTMing. There's an incredible wealth of knowledge over there, and active trading/selling community, and postings for private signings as well as consignment opportunities. More than worth the $15/year. That fee doesn't auto-renew so it's worth the one time gamble if you're on the fence. I'd bet you'll gladly renew after the first year. There and the premium membership here is all I've ever felt was worth my hobby dollars as far as sites go. 

Maybe start a second collection expressly for them. Yoiu could also put a "grade" in there for all of the signed cards as EX, and explain in your profile that cards graded "EX" are actually in-person AU cards - or something on that order.