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

7008 7 DD51 500 medium term low temperature models N gauge by CATO
7008 7 DD51 500 medium term low temperature models N gauge by CATO
$85.79
Time Remaining: 19d 9h 29m
Buy It Now for only: $85.79

Other On30 Scale train items recently purchased through this site:

7008 7 DD51 500 medium term low temperature models N gauge by CATO