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 trains'.

O ON30 SILVER CITY MODELS LOGGING STEAM BOILER FUEL TANK KIT
O ON30 SILVER CITY MODELS LOGGING STEAM BOILER FUEL TANK KIT
$39.95
Time Remaining: 2d 16h 6m
Buy It Now for only: $39.95
Overland Models HO HOn3 brass AH Log Loader w base unpainted NR
Overland Models HO HOn3 brass AH Log Loader w base unpainted NR
$765.00
Time Remaining: 3d 10h 50m
ON30 WISEMAN MODELS WSLC 5 TANK CAR
ON30 WISEMAN MODELS WSLC 5 TANK CAR
$59.99
Time Remaining: 4d 13h 8m
Buy It Now for only: $59.99
Built O On3 Cumbres Depot Structure Kit American Models Laserkit
Built O On3 Cumbres Depot Structure Kit American Models Laserkit
$295.00
Time Remaining: 5d 11h 23m
Buy It Now for only: $295.00
Built O On3 Rio Grande Section House American Models Laserkit
Built O On3 Rio Grande Section House American Models Laserkit
$165.00
Time Remaining: 5d 13h 33m
Buy It Now for only: $165.00
SMOB HO Sawmill Outbuilding Kits 4 HO HOn3 by KMP Models ON SALE ONLY 2 LEFT
SMOB HO Sawmill Outbuilding Kits 4 HO HOn3 by KMP Models ON SALE ONLY 2 LEFT
$72.65
Time Remaining: 13d 11h 48m
Buy It Now for only: $72.65
BLACKSMITH SHOP WITH DETAILS HO HON30 HON3 KIT 4010 SEQUOIA MODELS
BLACKSMITH SHOP WITH DETAILS HO HON30 HON3 KIT 4010 SEQUOIA MODELS
$25.99
Time Remaining: 15d 9h 12m
Buy It Now for only: $25.99
RIO GRANDE MODELS DRGW FLANGER
RIO GRANDE MODELS DRGW FLANGER
$28.00
Time Remaining: 17d 17h 49m
Buy It Now for only: $28.00
HOn3 DRGW 30FT REFRIDGERATOR CAR KIT BY TIMBER CREEK MODELS
HOn3 DRGW 30FT REFRIDGERATOR CAR KIT BY TIMBER CREEK MODELS
$34.00
Time Remaining: 17d 17h 51m
Buy It Now for only: $34.00
RIO GRANDE MODELS DRGW WATER CAR 0470
RIO GRANDE MODELS DRGW WATER CAR 0470
$28.00
Time Remaining: 17d 17h 59m
Buy It Now for only: $28.00
ON3 ON30 SILVER CITY MODELS DRGW 1872 17 4 WHEEL GONDOLA CAR KIT
ON3 ON30 SILVER CITY MODELS DRGW 1872 17 4 WHEEL GONDOLA CAR KIT
$26.00
Time Remaining: 23d 15h 15m
Buy It Now for only: $26.00
ON3 ON30 SILVER CITY MODELS DRGW 1872 12 4 WHEEL BOX CAR KIT
ON3 ON30 SILVER CITY MODELS DRGW 1872 12 4 WHEEL BOX CAR KIT
$36.00
Time Remaining: 23d 15h 15m
Buy It Now for only: $36.00
On3 On30 WISEMAN MODELS SM 102 DRGW OPEN PLATFORM COMBINE PASSENGER CAR
On3 On30 WISEMAN MODELS SM 102 DRGW OPEN PLATFORM COMBINE PASSENGER CAR
$89.95
Time Remaining: 24d 11h 52m
Buy It Now for only: $89.95
RIO GRANDE MODELS DRGW AIR DUMP GONDOLA
RIO GRANDE MODELS DRGW AIR DUMP GONDOLA
$25.00
Time Remaining: 29d 2h 40m
Buy It Now for only: $25.00

Other On30 Scale train items recently purchased through this site:

ON30 WISEMAN MODELS WSLC 5 TANK CAR
SMOB HO Sawmill Outbuilding Kits 4 HO HOn3 by KMP Models ON SALE ONLY 2 LEFT
Built O On3 Cumbres Depot Structure Kit American Models Laserkit
RIO GRANDE MODELS DRGW WATER CAR 0470
RIO GRANDE MODELS DRGW AIR DUMP GONDOLA
O ON30 SILVER CITY MODELS LOGGING STEAM BOILER FUEL TANK KIT
ON3 ON30 SILVER CITY MODELS DRGW 1872 17 4 WHEEL GONDOLA CAR KIT
On3 On30 WISEMAN MODELS SM 102 DRGW OPEN PLATFORM COMBINE PASSENGER CAR
ON3 ON30 SILVER CITY MODELS DRGW 1872 12 4 WHEEL BOX CAR KIT
RIO GRANDE MODELS DRGW FLANGER
HOn3 DRGW 30FT REFRIDGERATOR CAR KIT BY TIMBER CREEK MODELS
Built O On3 Rio Grande Section House American Models Laserkit
BLACKSMITH SHOP WITH DETAILS HO HON30 HON3 KIT 4010 SEQUOIA MODELS
Overland Models HO HOn3 brass AH Log Loader w base unpainted NR