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

Kato Japan 14 503 1 Chibi Den Streetcar Tram Train N scale Railway model
Kato Japan 14 503 1 Chibi Den Streetcar Tram Train N scale Railway model
$52.50
Time Remaining: 7d 2h 6m
Buy It Now for only: $52.50
On30 Scale Ultimate Railroad Prototype Picture CD Collection Set 25000+ images
On30 Scale Ultimate Railroad Prototype Picture CD Collection Set 25000+ images
$99.99
Time Remaining: 21d 18h 57m
Buy It Now for only: $99.99

Other On30 Scale train items recently purchased through this site:

On30 Scale Ultimate Railroad Prototype Picture CD Collection Set 25000+ images
Kato Japan 14 503 1 Chibi Den Streetcar Tram Train N scale Railway model