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

KATO N gauge 209 based 500 series PS28 equipped Ch Sbu Line Basic 6 Car Set 1
KATO N gauge 209 based 500 series PS28 equipped Ch Sbu Line Basic 6 Car Set 1
$277.40
Time Remaining: 1d 22h 4m
Buy It Now for only: $277.40
Kato N Gauge E231 System 0 Series Ch   S bu Line 6 Both Basic Set 10 1520 M
Kato N Gauge E231 System 0 Series Ch S bu Line 6 Both Basic Set 10 1520 M
$173.80
Time Remaining: 5d 5h 22m
Buy It Now for only: $173.80
Kato N Gauge E231 System 0 Series Ch   S bu Line 4 Both hematopoiesis Set 1
Kato N Gauge E231 System 0 Series Ch S bu Line 4 Both hematopoiesis Set 1
$95.47
Time Remaining: 5d 5h 24m
Buy It Now for only: $95.47
Double Track Attachment Set for Automatic Crossing Gate S Model Train
Double Track Attachment Set for Automatic Crossing Gate S Model Train
$70.05
Time Remaining: 5d 17h 59m
Buy It Now for only: $70.05
Unitrack Automatic Crossing Gate S Basic Set Model Train by Kato
Unitrack Automatic Crossing Gate S Basic Set Model Train by Kato
$186.19
Time Remaining: 5d 17h 59m
Buy It Now for only: $186.19
10 1572 Shinano Railway 115 Series Shounan Color Yokosuka Color 6Car Set S
10 1572 Shinano Railway 115 Series Shounan Color Yokosuka Color 6Car Set S
$250.82
Time Remaining: 5d 17h 59m
Buy It Now for only: $250.82
Kato HO Gauge HV 21 HO Uni Track Automatic Traffic Signal S Set 3 131 Japan
Kato HO Gauge HV 21 HO Uni Track Automatic Traffic Signal S Set 3 131 Japan
$139.80
Time Remaining: 5d 17h 59m
Buy It Now for only: $139.80
KATO N gauge 251 based super view Dancer appeared during coating 10 Car Set S
KATO N gauge 251 based super view Dancer appeared during coating 10 Car Set S
$308.85
Time Remaining: 7d 20h 4m
Buy It Now for only: $308.85
KATO N gauge 251 based super view Dancer appeared during coating 10 Car Set S
KATO N gauge 251 based super view Dancer appeared during coating 10 Car Set S
$270.39
Time Remaining: 13d 8h 28m
Buy It Now for only: $270.39
1950S ARROW SAGO BATTERY OPERATED TRAIN SET SANTA FE CHIEF  AA46
1950S ARROW SAGO BATTERY OPERATED TRAIN SET SANTA FE CHIEF AA46
$39.95
Time Remaining: 16d 8h 23m
Buy It Now for only: $39.95

Other On30 Scale train items recently purchased through this site:

1950S ARROW SAGO BATTERY OPERATED TRAIN SET SANTA FE CHIEF AA46
KATO N gauge 251 based super view Dancer appeared during coating 10 Car Set S
KATO N gauge 251 based super view Dancer appeared during coating 10 Car Set S
Kato N Gauge E231 System 0 Series Ch S bu Line 6 Both Basic Set 10 1520 M
Kato N Gauge E231 System 0 Series Ch S bu Line 4 Both hematopoiesis Set 1
KATO N gauge 209 based 500 series PS28 equipped Ch Sbu Line Basic 6 Car Set 1
Unitrack Automatic Crossing Gate S Basic Set Model Train by Kato
10 1572 Shinano Railway 115 Series Shounan Color Yokosuka Color 6Car Set S
Kato HO Gauge HV 21 HO Uni Track Automatic Traffic Signal S Set 3 131 Japan
Double Track Attachment Set for Automatic Crossing Gate S Model Train