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

On3 On30 WISEMAN MODEL SERVICES COLORADO  SOUTHERN PASSENGER COACH 70 KIT
On3 On30 WISEMAN MODEL SERVICES COLORADO SOUTHERN PASSENGER COACH 70 KIT
$99.95
Time Remaining: 3d 12h 41m
Buy It Now for only: $99.95
Accucraft DRGW San Juan Passenger Car Coaches AL84 201A B C D and E
Accucraft DRGW San Juan Passenger Car Coaches AL84 201A B C D and E
$3,000.00
Time Remaining: 9d 5h 39m
On3 On30 WISEMAN SM 108 SHORTY COACH OPEN PLATFORM PASSENGER CAR KIT
On3 On30 WISEMAN SM 108 SHORTY COACH OPEN PLATFORM PASSENGER CAR KIT
$89.95
Time Remaining: 22d 11h 19m
Buy It Now for only: $89.95

Other On30 Scale train items recently purchased through this site:

On3 On30 WISEMAN MODEL SERVICES COLORADO SOUTHERN PASSENGER COACH 70 KIT
On3 On30 WISEMAN SM 108 SHORTY COACH OPEN PLATFORM PASSENGER CAR KIT
Accucraft DRGW San Juan Passenger Car Coaches AL84 201A B C D and E