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 railway layouts'.

SUPERB BRIEFCASE MODEL RAILWAY LAYOUT AND TRAIN BY MOUNTAIN LAKE MODELS RAILWAYS
SUPERB BRIEFCASE MODEL RAILWAY LAYOUT AND TRAIN BY MOUNTAIN LAKE MODELS RAILWAYS
$1,718.27
Time Remaining: 4d 3h 6m
Buy It Now for only: $1,718.27

Other On30 Scale train items recently purchased through this site:

SUPERB BRIEFCASE MODEL RAILWAY LAYOUT AND TRAIN BY MOUNTAIN LAKE MODELS RAILWAYS