I know that when selling cards, you get about 20% of the actual book value, but I have about 7000 baseball, hockey, basketball and football cards from the early 90's and probably 90% of them are just commons and all of my doubles / triples etc. (There's nothing special about any of the cards) They're all in mint condition having been in boxes since day one, (some even in original packages). I know that alone they are worthless, but 7000 of them has to be worth something to a collector right? What would be a good selling price? $200? $300? $500? more? I've listed the series I collected below to help get an idea of what I have: Score Hockey 90-91 Pro Set Football 90-91 Upper Deck 91-92 Hockey (French & English Editions) 90-91 McDonalds Upper Deck Complete Set Pro Set Hockey 91-92 1991 OPC Premier Baseball (2 Complete Sets) 1991 Donruss Baseball 90-91 OPC Hockey 1990 Donruss Baseball 1990 Topps Baseball 1990 & 1991 Fleer Baseball Donruss 87 & Fleer 89 Baseball 1991 Topps Baseball 1990 Hoops Basketball 1990-1991 Upper Deck Hockey 1991 Upper Deck Baseball Any insight would be appreciated