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

Hawthorne Village Spirit of America Caboose
Hawthorne Village Spirit of America Caboose
$39.00
Time Remaining: 5d 11h 7m
Buy It Now for only: $39.00
Black Stone HOn3 Long Caboose Factory paint working Marker Lights Kadee 714s
Black Stone HOn3 Long Caboose Factory paint working Marker Lights Kadee 714s
$70.00
Time Remaining: 5d 20h 1m
On30On3 Narrow Gauge Custom Scratch Built On30 Boxcar and Caboose Nice Details
On30On3 Narrow Gauge Custom Scratch Built On30 Boxcar and Caboose Nice Details
$185.00
Time Remaining: 5d 21h 2m
Buy It Now for only: $185.00
THOMAS KINKADE CABOOSE CHRISTMAS EXPRESS ISSUE 12 6095
THOMAS KINKADE CABOOSE CHRISTMAS EXPRESS ISSUE 12 6095
$49.95
Time Remaining: 7d 1h 15m
Buy It Now for only: $64.99
Bachmann BAC26561 On30 18 Logging Caboose MOW Gray Data Only
Bachmann BAC26561 On30 18 Logging Caboose MOW Gray Data Only
$44.84
Time Remaining: 13d 18h 34m
Buy It Now for only: $44.84
AMS Accucraft AC83 131 RGS Brass Caboose NEW 1203
AMS Accucraft AC83 131 RGS Brass Caboose NEW 1203
$229.99
Time Remaining: 26d 15h 59m
Buy It Now for only: $229.99

Other On30 Scale train items recently purchased through this site:

Black Stone HOn3 Long Caboose Factory paint working Marker Lights Kadee 714s
On30On3 Narrow Gauge Custom Scratch Built On30 Boxcar and Caboose Nice Details
Hawthorne Village Spirit of America Caboose
Bachmann BAC26561 On30 18 Logging Caboose MOW Gray Data Only
THOMAS KINKADE CABOOSE CHRISTMAS EXPRESS ISSUE 12 6095
AMS Accucraft AC83 131 RGS Brass Caboose NEW 1203