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

Bachmann On30 Scale Train Tank Car Tank Car DS Fire Suppression 27122
Bachmann On30 Scale Train Tank Car Tank Car DS Fire Suppression 27122
$45.16
Time Remaining: 1d 15h 51m
Buy It Now for only: $45.16
Bachmann On30 Scale Train Tank Car Tank Car Standard Oil 27131
Bachmann On30 Scale Train Tank Car Tank Car Standard Oil 27131
$45.16
Time Remaining: 1d 15h 54m
Buy It Now for only: $45.16
Westside type Detailed Hon3 BRASS SINGLE DOME TANK CAR OB VG+Deal
Westside type Detailed Hon3 BRASS SINGLE DOME TANK CAR OB VG+Deal
$54.99
Time Remaining: 6d 22h 2m
Buy It Now for only: $54.99
On30 Scratch Built Pier Tank car for display only Not included
On30 Scratch Built Pier Tank car for display only Not included
$49.95
Time Remaining: 9d 16h 30m
Buy It Now for only: $64.95
On3 On30 WISEMAN MODEL SERVICES WEST SIDE LUMBER CO OIL TANK CAR 5 KIT
On3 On30 WISEMAN MODEL SERVICES WEST SIDE LUMBER CO OIL TANK CAR 5 KIT
$89.95
Time Remaining: 20d 18h 5m
Buy It Now for only: $89.95
HOn3 Silver Princess brass Union tank car in original box
HOn3 Silver Princess brass Union tank car in original box
$85.00
Time Remaining: 27d 21h 59m
Buy It Now for only: $85.00
HOn3 Silver Princess brass Gramps tank car in original box
HOn3 Silver Princess brass Gramps tank car in original box
$65.00
Time Remaining: 27d 21h 59m
Buy It Now for only: $65.00
Lot of 2 BLACKSTONE HOn3 B370109 DRGW UTLX 48 Arch Bar Tank Car Trucks
Lot of 2 BLACKSTONE HOn3 B370109 DRGW UTLX 48 Arch Bar Tank Car Trucks
$34.99
Time Remaining: 28d 9h 57m
Buy It Now for only: $34.99
Lot of 2 BLACKSTONE HOn3 B370110 DRGW UTLX 48 Bettendorf Tank Car Trucks
Lot of 2 BLACKSTONE HOn3 B370110 DRGW UTLX 48 Bettendorf Tank Car Trucks
$34.99
Time Remaining: 28d 10h
Buy It Now for only: $34.99

Other On30 Scale train items recently purchased through this site:

On30 Scratch Built Pier Tank car for display only Not included
Westside type Detailed Hon3 BRASS SINGLE DOME TANK CAR OB VG+Deal
On3 On30 WISEMAN MODEL SERVICES WEST SIDE LUMBER CO OIL TANK CAR 5 KIT
Bachmann On30 Scale Train Tank Car Tank Car DS Fire Suppression 27122
Lot of 2 BLACKSTONE HOn3 B370109 DRGW UTLX 48 Arch Bar Tank Car Trucks
HOn3 Silver Princess brass Gramps tank car in original box
HOn3 Silver Princess brass Union tank car in original box
Bachmann On30 Scale Train Tank Car Tank Car Standard Oil 27131
Lot of 2 BLACKSTONE HOn3 B370110 DRGW UTLX 48 Bettendorf Tank Car Trucks