Hey thought I would chime in, I've been shopping for a reasonable Zero since I test road a new DS in early 2015, the dealer I road it at was Maverick Motorsports in Missoula MT, out of the way for sure (2 hours from me) I also checked with the Seattle Triumph dealer and found several options, at the time they wanted $13k for their demo bike, only a slight discount, and I didn't have a specific interest in a DS. Later on in 2016 in Seattle I found a used 2014 SR for 9k, it had better acceleration then the 15 DS and farther range, but the suspension, and breaking system was less desirable. Checking back at the DS demo model was down to $11,400 and qualified for the tax credit, however, the tax credit only applies if you owe taxes not if you get a tax return. With my income around 25k annually I do not owe taxes so that didn't appeal to me. I held out on buying either and found a 2015 SR on eBay for 12k, offered 9.5k and settled on $10,250, a great price. The bike came with a quick charger less than 500 miles and a pair of Zero brand leather gloves. It's in the garage now and I couldn't be happier, even with the Empulse TT's going for 6k I know I made the right choice. The market is slim because most people haven't payed off their 2013+ Zero's yet and don't want to take a hit in addition to the scarce sales numbers Zero actually puts out. It'll take more popularity in ebikes for the used market to grow.
Oh around the same time I saw a used 2014 DS for like 12k on Craigslist.
Hope my insights provide something useful,
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