We've searched the internet and found the largest collection of On30 Scale trains for sale is on eBay. Below are the listings for '0 scale'.

On30 or 0 scale Logging Truck custom built and weathered after historic picture
On30 or 0 scale Logging Truck custom built and weathered after historic picture
$148.00
Time Remaining: 1d 27m
On30 or 0 scale Logging Truck for diorama custom weathered lot 7
On30 or 0 scale Logging Truck for diorama custom weathered lot 7
$78.00
Time Remaining: 1d 27m
NEW Hawthorne Village ON30 Scale 2 6 0 Loco  Tender Christmas Express Bundle
NEW Hawthorne Village ON30 Scale 2 6 0 Loco Tender Christmas Express Bundle
$125.00
Time Remaining: 1d 11h
DESIGN TECH FORKS CREEK PUMP HOUSE KIT DT 104 0 O SCALE 148
DESIGN TECH FORKS CREEK PUMP HOUSE KIT DT 104 0 O SCALE 148
$40.00
Time Remaining: 1d 22h 3m
Bachmann On30 Scale Train Steam 0 4 2 Porter DCC Equipped Greenbrier
Bachmann On30 Scale Train Steam 0 4 2 Porter DCC Equipped Greenbrier
$62.21
Time Remaining: 16d 21h 51m
Buy It Now for only: $62.21
Bachmann On30 Scale Train Steam Locomotive 2 6 0 Analog Christmas 25227
Bachmann On30 Scale Train Steam Locomotive 2 6 0 Analog Christmas 25227
$149.76
Time Remaining: 29d 18h 18m
Buy It Now for only: $149.76
Bachmann On30 Scale Train Steam Loco 2 6 0 Analog White Pass  Yukon 56 25250
Bachmann On30 Scale Train Steam Loco 2 6 0 Analog White Pass Yukon 56 25250
$149.76
Time Remaining: 29d 18h 18m
Buy It Now for only: $149.76
Bachmann On30 Scale Train Steam Loco 2 6 0 Analog Colorado Mining Company 25262
Bachmann On30 Scale Train Steam Loco 2 6 0 Analog Colorado Mining Company 25262
$149.76
Time Remaining: 29d 18h 18m
Buy It Now for only: $149.76
Bachmann On30 Scale Train Steam Loco 2 6 0 DCC Sound Ready DRGW 29301
Bachmann On30 Scale Train Steam Loco 2 6 0 DCC Sound Ready DRGW 29301
$262.65
Time Remaining: 29d 18h 22m
Buy It Now for only: $262.65
Bachmann On30 Scale Train Steam Loco 2 6 0 DCC Sound Ready Painted Black 29304
Bachmann On30 Scale Train Steam Loco 2 6 0 DCC Sound Ready Painted Black 29304
$262.65
Time Remaining: 29d 18h 23m
Buy It Now for only: $262.65
Bachmann On30 Scale Train Steam Loco 2 6 0 DCC Sound Ready Bumble Bee 29302
Bachmann On30 Scale Train Steam Loco 2 6 0 DCC Sound Ready Bumble Bee 29302
$262.65
Time Remaining: 29d 18h 23m
Buy It Now for only: $262.65
Bachmann On30 Scale Train Steam Loco 2 6 0 DCC Sound Ready PRR 29303
Bachmann On30 Scale Train Steam Loco 2 6 0 DCC Sound Ready PRR 29303
$262.65
Time Remaining: 29d 18h 23m
Buy It Now for only: $262.65

Other On30 Scale train items recently purchased through this site:

DESIGN TECH FORKS CREEK PUMP HOUSE KIT DT 104 0 O SCALE 148
On30 or 0 scale Logging Truck custom built and weathered after historic picture
On30 or 0 scale Logging Truck for diorama custom weathered lot 7
Bachmann On30 Scale Train Steam 0 4 2 Porter DCC Equipped Greenbrier
Bachmann On30 Scale Train Steam Loco 2 6 0 Analog Colorado Mining Company 25262
Bachmann On30 Scale Train Steam Loco 2 6 0 DCC Sound Ready Painted Black 29304
Bachmann On30 Scale Train Steam Loco 2 6 0 Analog White Pass Yukon 56 25250
Bachmann On30 Scale Train Steam Locomotive 2 6 0 Analog Christmas 25227
Bachmann On30 Scale Train Steam Loco 2 6 0 DCC Sound Ready DRGW 29301
NEW Hawthorne Village ON30 Scale 2 6 0 Loco Tender Christmas Express Bundle
Bachmann On30 Scale Train Steam Loco 2 6 0 DCC Sound Ready PRR 29303
Bachmann On30 Scale Train Steam Loco 2 6 0 DCC Sound Ready Bumble Bee 29302