As Sportscommish says, folks would want to know what you have for sale..
Personally, I've found it very difficult to sell cards here since most people want to trade..
And you can buy cards crazy cheap on eBay..I just bought some late 1970's/early 1980's Topps Football lots for .99 each on eBay..I paid more for shipping than I did for the cards..
My advice is to determine what your bottom line is and then try to sell then locally..I have sold many thousands of cards and numerous sets in the last year, had very little interest and got very little money for them...I may have even donated some to Goodwill because I had no takers..
Not to be a debbie downer but I've found it very hard to sell cards and/or when they do sell, people want them dirt cheap..
Just my opinion though..You may have some cards that people are super interested in..