BB cards have lost lot of value and allure over the years. I have tons of them sitting in my basement. I have a MJ that is booked value $5k, would love to sell it and put it towards my 15 mo college fund.
Mint: Hum, talking to collectors you'll soon learn your "mint" card isn't that mint. Cards won't sell for anywhere near book value. They might sell for 30% of book value to a dealer or maybe even less.
Some single cards might be worth something but for the mostpart complete sets of 9.3+ rated (out of 10) are the only things with value. The internet has destroyed the card market.
I have complete sets of Topps baseball cards from 1958 to 1970 and they are worth a fraction of what they were in the early 80s. If the cards have been handled they are usually rated 4-7 (again out of 10) and no cards are rated a perfect 10.
Triple Crown in Naperville will tell you to get the card certified and then he'll sell it on consignment but unless it's a totally rare gem he won't buy it outright.
There is a guy named Tim in Chicago who buys cards but to give you perspective he offered me $1025 for all my cards. Tim is on a buying spree. He drives around the country buying out card dealers who want to retire. I think he offers them 5% of what their inventory is worth.
He says he's so loaded with cards he completely hasn't cataloged them. To that he adds that he's afraid to have anyone else help him out because theft is so common in the shop. He says that shop owners run a bigger risk of theft from employees than customers.
Anyway, I don't have any thoughts on selling cards other than you could post it on ebay and see if it sells. Most ebay buyers want their cards certified though and that certification/authentication process costs money. Might be worth doing 6-12 cards but not complete sets.
Better bet would be Craigslist and find a local buyer. I sold an Ernie Banks Hartland statue from the 60s for $225 to a cop I met on Craigslist. He was building a complete set of them but I had it on Craigslist for months and updating the posting weekly was a pain.