Is there a price "guide" for BBCE wrapped items?

Starting to see a lot of BBCE wrapped boxes and racks for sale. The prices vary. What's the way to determine what is fair value for a BBCE wrapped racks pack? Example: 1975 BB rack - no stars showing - what would be a fair price to pay.
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Another option is to go on BBCE's Buying Page and see what they're currently paying for items. It seems that their markup isn't too high, so this could give you a ballpark range.
I, too, have wondered this. There are some boxes online I'd be interested in but don't want to buy something that someone may have simply marked-up due to BBCE not having the product in stock.
Best and good luck!
Patrick
1) Completed (sold) listings on ebay
2) Completed transactions on here
3) What Steve is selling the item for if he has it