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'.

Hawthorne Village Coca Cola Train Gondola Car NIP
Hawthorne Village Coca Cola Train Gondola Car NIP
$29.99
Time Remaining: 2d 18h 37m
Buy It Now for only: $29.99
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: 5d 21h 9m
Buy It Now for only: $26.00
WINTER FUN GONDOLA 2009 HAWTHORNE MM HOLIDAY EXPRESS FIGURE AND TRACK NIB
WINTER FUN GONDOLA 2009 HAWTHORNE MM HOLIDAY EXPRESS FIGURE AND TRACK NIB
$84.99
Time Remaining: 7d 12h 51m
Buy It Now for only: $84.99
BACHMANN SPECTRUM On30 HIGH SIDE GONDOLAfrom RAGS to RICHES
BACHMANN SPECTRUM On30 HIGH SIDE GONDOLAfrom RAGS to RICHES
$75.95
Time Remaining: 8d 18h 26m
Buy It Now for only: $98.75
On3 On30 WISEMAN CSM004 BACKWOODS LOGGING MINING 4 WHEEL LOW SIDE GONDOLA KIT
On3 On30 WISEMAN CSM004 BACKWOODS LOGGING MINING 4 WHEEL LOW SIDE GONDOLA KIT
$27.95
Time Remaining: 19d 18h 51m
Buy It Now for only: $27.95

Other On30 Scale train items recently purchased through this site:

Hawthorne Village Coca Cola Train Gondola Car NIP
ON3 ON30 SILVER CITY MODELS DRGW 1872 17 4 WHEEL GONDOLA CAR KIT
WINTER FUN GONDOLA 2009 HAWTHORNE MM HOLIDAY EXPRESS FIGURE AND TRACK NIB
On3 On30 WISEMAN CSM004 BACKWOODS LOGGING MINING 4 WHEEL LOW SIDE GONDOLA KIT
BACHMANN SPECTRUM On30 HIGH SIDE GONDOLAfrom RAGS to RICHES