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'.

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 4h 28m
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: 2d 11h 19m
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: 2d 11h 19m
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: 2d 11h 19m
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: 2d 11h 24m
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: 2d 11h 24m
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: 2d 11h 24m
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: 2d 11h 24m
Buy It Now for only: $262.65
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: 4d 10h 25m
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: 5d 15h 52m
On30 Scale Bachmann Spectrum No25242 2 6 0 Steam Locomotive DRGW
On30 Scale Bachmann Spectrum No25242 2 6 0 Steam Locomotive DRGW
$189.95
Time Remaining: 16d 14h 25m
Buy It Now for only: $189.95
Bachmann On30 Scale Train Steam 0 4 2 Porter DCC Equipped w Maroon
Bachmann On30 Scale Train Steam 0 4 2 Porter DCC Equipped w Maroon
$65.48
Time Remaining: 19d 14h 52m
Buy It Now for only: $65.48

Other On30 Scale train items recently purchased through this site:

On30 or 0 scale Logging Truck for diorama custom weathered lot 7
On30 or 0 scale Logging Truck custom built and weathered after historic picture
Bachmann On30 Scale Train Steam 0 4 2 Porter DCC Equipped w Maroon
Bachmann On30 Scale Train Steam Loco 2 6 0 Analog Colorado Mining Company 25262
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
Bachmann On30 Scale Train Steam Loco 2 6 0 Analog White Pass Yukon 56 25250
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 Painted Black 29304
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 PRR 29303
On30 Scale Bachmann Spectrum No25242 2 6 0 Steam Locomotive DRGW