Evil-bay DD-2s last year werebasically going around 110US to about 135US with the ODD one (box papers etc) going over $150.
Now most are listed at 150, 165, 180, and up with BIN. However, there still seems to be quite a few, if they say start listing them at $50 or $75 don't climb much in last minute bidding. Pricing is all over the map, but sellers are way more agressive with a high BIN price on the DD-2.
IMO, worth every dime. I use 2 stacked.
Somebody in another thread said best way is to score a low BIN from say and estate person who just "thinks all guitar pedals are $50". this is the best strategy search boss japan in musical instruments BIN only every morning and you may strike gold.
I will never forget the minty DM-2 i missed for BIN $19.95 by about 1 hour .... while i was supposed to be working.
That is what I've noticed from my two years and counting of watching the ebay everyday. Tracking only pedals that come with boxes and /or manuals. If it comes with a box the CE-1 will jump a few places.
The spectrum and vibrato always seem to go for the most. I think the most depressing thing was seeing a box for a Dm-2 going for over �40....especially when my Boxed Dm-2 cost me only �35 from the local second hand paper I don't think I'd pay more than �100 for an old boss pedal though, I've been lucky before and I'll be lucky again...hopefully! I would pay the retail price for something like a dd-20 or rc-20xl though.