Segways are divided into the categories of gen 1 and gen 2. The gen 1 are the older machines that haven't been manufactured since 2006, and the gen 2 ones are the newer ones.
Generation 1 machines include such models as p133, XT,e167,i180/GT and i167/i170. You may still be able to find some of these on the market, as well as parts for these, but primarily you till find the second generation machines such as model i2, x2 and the various manifestations of these such as the patroller or the golf variations that are specially equipped for their purposes.
Here are some of the generation 2 Segways that are currently up for auction on Ebay.
Segway X2 Models
|Local Pickup preferred 2010 Segway X2 240 miles Exc Cond $4,700.00 Time Remaining: 13h 56m Buy It Now for only: $4,700.00||2013 Segway X2 $5,000.00 Time Remaining: 15h 58m Buy It Now for only: $6,500.00||Segway X2 x2SE off road new sealed express ship 2014 SE free light 0 miles $6,599.00 Time Remaining: 1d 9h 46m Buy It Now for only: $6,599.00|
|Black Segway i2 Transporter bonus new demo fast ship $5,999.00 Time Remaining: 13h 37m Buy It Now for only: $5,999.00||Black Segway i2 Transporter with bench seat handicapped paraplegic elderly new $7,499.00 Time Remaining: 1d 14h 52m Buy It Now for only: $7,499.00||Segway I2 ONLY 99 miles $3,750.00 Time Remaining: 1d 17h 3m Buy It Now for only: $3,750.00|