I see about one or two a month around town, more than half are kit bikes. There are a few in most of the shops I go into, although I don't go into many. Not that my very small personal sample means anything.
Sales numbers are hard to verify, and will vary from whoever is assembling them, but they these tend to be about in line with what I've seen in the past. Who knows if they are accurate?
20,200,000 adult bikes sold in the US in 2015, 263,000 total ebikes in 2016 = 1.3% of the total using those numbers. Which isn't the most accurate, but I'd venture its in the low single digits somewhere, I've not come across anything to suggest otherwise.
I found this interesting and could be one reason you see the numbers bounce around a bit. “The main obstacle to obtain exact import volumes for the USA market is the lack of a specific HS code for e-bikes. Therefore thousands of individual records are evaluated by hand as many products that would not be conventionally regarded as an “electric bike” may be listed as such, or in similar terms. One obstacle to correctly identifying e-bike shipments in particular is the prevalence of ‘hoverboard’ ride-on electric toys, which are almost always listed in import records as electric bicycles.”
Huge Increase in Number of US E-Bike Importers
https://www.statisticbrain.com/bicyc...ry-statistics/