Before I got my 505, I tried bidding on several used 500s and 505s on eBay, but they were going for almost $200, some even more, both 500s and 505s (the bidders didn't seem to be aware of the difference).
So $100 is very much below market value.
If you want to upgrade (and I love my 505, am so glad I got it instead of the 500), you'd be better off selling your old one, especially if you have all the accessories.
Kate
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