Was just browsing the EV Finder classifieds page and saw a GPR-S listed. Turns out that Electric Motorsport lists them from time to time for sale with no batteries and a buy-it-now price of $3500. Of course it needs batteries to get running and they do sell batteries separately or you can play with your own idea of what's the best battery pack to use.
The specs for the specific auction I looked at is listed below. One of the battery options is a 72 volt 20 amp-hour lead-acid pack they say will get you up to 65 miles/hr and deliver 10-25 miles range depending on how you ride it. That pack costs $348, charger about $200. Approx $4000 if you live in the SF Bay Area and/or can just pick it up. The widget below lists the auctions they have on eBay ...
Motor: Electric Motorsport RT
Peak Power: 19 HP
Controller: Alltrax AXE7234
(24-72vdc 300 Amp)
Top Speed: 65 mph
Max Range: 40 Miles
Brakes: Dual Hydraulic Disk
Gearing: 4.12 / 1
Sprockets 14T drive, 58T driven
Dimensions:
Overall Length: 1900 mm
Overall Width: 670 mm
Overall Height: 1135 mm
WheelBase: 1315 mm
Seat Height: 750mm
Max Wt Capacity: 560 lbs
Curb Weight: ~285 lbs (with batteries)
Frame: Powder coated steel with braced aluminum swing arm.
Running:
Front Wheel Travel: 95mm
Rear Wheel Travel: 110mm
Stock Front Tire: IRC 90/80 x 17
Stock Rear Tire: IRC 110/80 x 17
Brakes-front & rear: Hydraulic Disc
Front Brake: 290mm
Rear Brake: 200mm
Suspension:
Front Suspension: Inverted 35mm, 110mm travel
Rear Suspension: Dual oil coil spring shocks, 115mm travel
Drive Train: Direct chain drive
Riders: Two passenger
Hand bars: Upright
Wheels: Alloy racing mag
