We've searched the internet and found the largest collection of On30 Scale trains for sale is on eBay. Below are the listings for 'Trolley'.

On30 7mm Brill Demi Tram Car with open ends Smallbrook studio
On30 7mm Brill Demi Tram Car with open ends Smallbrook studio
$78.42
Time Remaining: 19d 10h 3m
Buy It Now for only: $78.42
Bachmann On30 Scale Train Streetcar Analog United Traction 25128
Bachmann On30 Scale Train Streetcar Analog United Traction 25128
$82.03
Time Remaining: 32d 12h 2m
Buy It Now for only: $82.03

Other On30 Scale train items recently purchased through this site:

Bachmann On30 Scale Train Streetcar Analog United Traction 25128
On30 7mm Brill Demi Tram Car with open ends Smallbrook studio