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

Bachmann Santas eXpress set in on30 beat the Christmas rush
Bachmann Santas eXpress set in on30 beat the Christmas rush
$79.95
Time Remaining: 4d 9h 3m
ENHANCED Spectrum On30 CS set
ENHANCED Spectrum On30 CS set
$449.00
Time Remaining: 12d 14h 19m
Buy It Now for only: $449.00

Other On30 Scale train items recently purchased through this site:

Bachmann Santas eXpress set in on30 beat the Christmas rush
ENHANCED Spectrum On30 CS set