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: 4d 37m
Buy It Now for only: $99.95
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 23h 15m
Buy It Now for only: $89.95
Bachmann On30 Scale Train Passenger Coach Observation Burgundy  Black 26201
Bachmann On30 Scale Train Passenger Coach Observation Burgundy Black 26201
$41.28
Time Remaining: 24d 12h 42m
Buy It Now for only: $41.28

Other On30 Scale train items recently purchased through this site:

Bachmann On30 Scale Train Passenger Coach Observation Burgundy Black 26201
On3 On30 WISEMAN MODEL SERVICES COLORADO SOUTHERN PASSENGER COACH 70 KIT
On3 On30 WISEMAN SM 108 SHORTY COACH OPEN PLATFORM PASSENGER CAR KIT