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: 2d 16h 35m
Buy It Now for only: $299.99
009 MBD1 130 RAILBUS 3d PRINTED BODYSHELL for the KATO 11 103 CHASSIS Stockno2
009 MBD1 130 RAILBUS 3d PRINTED BODYSHELL for the KATO 11 103 CHASSIS Stockno2
$38.74
Time Remaining: 2d 20h 9m
Buy It Now for only: $38.74

Other On30 Scale train items recently purchased through this site:

Bemo HOm HOe DR VT 133525 Wismarer Rail Bus TSL
009 MBD1 130 RAILBUS 3d PRINTED BODYSHELL for the KATO 11 103 CHASSIS Stockno2