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

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: 6h 34m
Buy It Now for only: $26.00
2 car set 1203 Scale Narrow Gauge Fall River Gondola flat car
2 car set 1203 Scale Narrow Gauge Fall River Gondola flat car
$260.00
Time Remaining: 4d 20h 55m
Buy It Now for only: $260.00
ON3 ON30 SILVER CITY MODELS DRGW 1872 14 4 WHEEL GONDOLA CAR KIT
ON3 ON30 SILVER CITY MODELS DRGW 1872 14 4 WHEEL GONDOLA CAR KIT
$26.00
Time Remaining: 9d 21h 51m
Buy It Now for only: $26.00
HO HO HO HOLIDAY GONDOLA CAR HAWTHORNE RUDOLPHS CHRISTMAS TOWN EXPRESS NIB
HO HO HO HOLIDAY GONDOLA CAR HAWTHORNE RUDOLPHS CHRISTMAS TOWN EXPRESS NIB
$74.99
Time Remaining: 21d 15h 14m
Buy It Now for only: $74.99
SN3 PBL D7RGW Pipe Gondola kit PBL R 10
SN3 PBL D7RGW Pipe Gondola kit PBL R 10
$34.95
Time Remaining: 27d 11h 31m
Buy It Now for only: $34.95
Bachmann On30 Scale Train 18 Freight Cars Low Gondola 2 box 26531
Bachmann On30 Scale Train 18 Freight Cars Low Gondola 2 box 26531
$69.24
Time Remaining: 29d 18h 6m
Buy It Now for only: $69.24
Bachmann On30 Scale Train 18 Freight Cars High Gondola 2 box 26541
Bachmann On30 Scale Train 18 Freight Cars High Gondola 2 box 26541
$74.51
Time Remaining: 29d 18h 6m
Buy It Now for only: $74.51
Bachmann On30 Scale Train Gondola White Pass  Yukon 27203
Bachmann On30 Scale Train Gondola White Pass Yukon 27203
$39.13
Time Remaining: 29d 18h 10m
Buy It Now for only: $39.13
Bachmann On30 Scale Train Gondola Mow Gray Data Only 27202
Bachmann On30 Scale Train Gondola Mow Gray Data Only 27202
$39.13
Time Remaining: 29d 18h 10m
Buy It Now for only: $39.13

Other On30 Scale train items recently purchased through this site:

ON3 ON30 SILVER CITY MODELS DRGW 1872 14 4 WHEEL GONDOLA CAR KIT
ON3 ON30 SILVER CITY MODELS DRGW 1872 17 4 WHEEL GONDOLA CAR KIT
2 car set 1203 Scale Narrow Gauge Fall River Gondola flat car
Bachmann On30 Scale Train 18 Freight Cars High Gondola 2 box 26541
SN3 PBL D7RGW Pipe Gondola kit PBL R 10
Bachmann On30 Scale Train 18 Freight Cars Low Gondola 2 box 26531
HO HO HO HOLIDAY GONDOLA CAR HAWTHORNE RUDOLPHS CHRISTMAS TOWN EXPRESS NIB
Bachmann On30 Scale Train Gondola Mow Gray Data Only 27202
Bachmann On30 Scale Train Gondola White Pass Yukon 27203