What sites are available to sell original boxes? A couple of years ago, I stumbled across a site (not Ebay) where LEGO fans buy and sell items.  I have some large boxes for various sets to sell.  All my son's LEGO collection is in plastic boxes, and I don't think he has any interest in keeping the boxes.  I also have all the original instructions, and noticed somebody talking about some really high prices.  

Can any of you refer me to a good site for selling, other than Ebay?

I do sell on Ebay (going through closets and such as awe downsize), but I figured these would be more interesting to LEGO collectors.
You probably came across BrickLink.

They sell pretty much anything LEGO related, including original boxes and instruction books.