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 railways'.

SUPERB BRIEFCASE MODEL RAILWAY LAYOUT AND TRAIN BY MOUNTAIN LAKE MODELS RAILWAYS
SUPERB BRIEFCASE MODEL RAILWAY LAYOUT AND TRAIN BY MOUNTAIN LAKE MODELS RAILWAYS
$1,727.14
Time Remaining: 11d 9h 33m
Buy It Now for only: $1,727.14
Dundas Models DM56 Festiniog Railway Granite End Door Wagon Pack of 5 T48
Dundas Models DM56 Festiniog Railway Granite End Door Wagon Pack of 5 T48
$37.65
Time Remaining: 13d 20h 48m
Buy It Now for only: $37.65
Dundas Models DM25 Festiniog Railway 2 Ton Steel Sided Slate Wagon 5 Pack T48
Dundas Models DM25 Festiniog Railway 2 Ton Steel Sided Slate Wagon 5 Pack T48
$35.56
Time Remaining: 13d 20h 49m
Buy It Now for only: $35.56

Other On30 Scale train items recently purchased through this site:

SUPERB BRIEFCASE MODEL RAILWAY LAYOUT AND TRAIN BY MOUNTAIN LAKE MODELS RAILWAYS
Dundas Models DM56 Festiniog Railway Granite End Door Wagon Pack of 5 T48
Dundas Models DM25 Festiniog Railway 2 Ton Steel Sided Slate Wagon 5 Pack T48