If you know a little about grading of stamps and coins, ebay is also a kinda good place for value. The only issue with ebay is you would have to list them and sell them yourself. It takes time. If you want to get rid of them all at one time, do as already suggested. Keep in mind, the offer will be lower than going prices. Some people just want to get rid of the whole lot, nothing wrong with that.
Good luck, it's a tough thing to do, I've done it.