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'.

Bemo HOm HOe DR VT 133525 Wismarer Rail Bus TSL
Bemo HOm HOe DR VT 133525 Wismarer Rail Bus TSL
$299.99
Time Remaining: 4d 11h 23m
Buy It Now for only: $299.99
Bachmann Spectrum On30 Red Rail Bus  Trailer DCC on Board Little River Logging
Bachmann Spectrum On30 Red Rail Bus Trailer DCC on Board Little River Logging
$134.95
Time Remaining: 4d 14h 22m
Buy It Now for only: $185.00

Other On30 Scale train items recently purchased through this site:

Bachmann Spectrum On30 Red Rail Bus Trailer DCC on Board Little River Logging
Bemo HOm HOe DR VT 133525 Wismarer Rail Bus TSL