Any saw is worth what you're willing to pay for it. I've seen 020's and 011's go on ebay for $80 or less, but then again, you've got shipping costs and the chance of not getting what you expexted when it arrives. But you also have to think about what, if anything will be required from you to get it running. When I bought an 020 on ebay, I had to figure in the price of converting it from 1/4" to 3/8" Picco bar/chain/sprocket. If the saw fits your needs, is in good condition, runs well out the door, and is readily available from a good source then I think $80 would be somewhat fair-especially with two bars. I wouldn't call it a steal, but I'd call it a fair price.
Take care all,
Jeff