To add to what John posted above, except for a few exceptions (i.e. Original HL102, revised HL102, HL111 etc.), if you can get 25 cents on the dollar you will be doing good. When, an if you check Ebay, don't look at what the sellers are asking for their pieces, but, rather check completed listings and see what they ACTUALLY sold for. Also, forget what the pieces used to sell for during HLs peak period or what you paid for them and concentrate on what they are worth now. I paid $500 for my first revised HL102 in 1996 and since that time I bought another one several years ago for $80.00.