eBay definitely, just make sure you get as much info into the title as possible, and make sure it is spelt right if you are selling. If you're buying put dodgy spelling into the search, surprising how many bargains can be found by the seller misspelling the item . I wasn't having a pop at your spelling mate was an honest answer. Memorabilia
If you're selling really rare stuff, you'd be better going to a proper Auction House to sell - theres one in east boldon, but they don't do many Sports stuff - if its just programmes and the like, then eBay, as mentioned above