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

SPECTRUM NARROW GAUGE  RAIL BUS  FULL INTERIOR  UNDEC On30 Scale TrainNEW
SPECTRUM NARROW GAUGE RAIL BUS FULL INTERIOR UNDEC On30 Scale TrainNEW
$129.97
Time Remaining: 28d 18h 41m
Buy It Now for only: $129.97

Other On30 Scale train items recently purchased through this site:

SPECTRUM NARROW GAUGE RAIL BUS FULL INTERIOR UNDEC On30 Scale TrainNEW