Most garage sales guidelines say to price at 10-20% of original cost. That's been my experience, you get about 10 cents on the dollar. If you KNOW there are stampers likely to attend, maybe price on the high side of that. And separate out any really RARE sets and check eBay to see what they actually sold for.
I want to add that a garage sale may not be the best place to sell stamps unless it is one of those sales organized to attract crafters. If you want best price, you might be better off in the BST forums, possibly. Or at least check the ISO Forum (In Search Of) to see if anyone is looking for any of the sets you are going to part with.
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