Scott, as with everything else, slots and keys are worth whatever one will pay for it. Personally, I don't buy (only trade) any cards or keys, but here is the guide line I got from Pat Lamb and I use it regarding the worth of cards and keys.

Remember I am referring to only current cards/keys and common obsolete ones offered on Ebay.

Between $0.50 and $1.00 for Cards with names on them and keys.

Approximately $3.00 to $5.00 for blank cards.

Hope this helps.

But Scott, I personally appreciate your sending these out free of no cost to us and I am sure many others feel the same way. There are quite a few people doing the same.