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'.

g Bachmann On 30 BOXED 27714 Caboose PRR Pennsylvania Railroad
g Bachmann On 30 BOXED 27714 Caboose PRR Pennsylvania Railroad
$30.00
Time Remaining: 15d 17h 10m
Buy It Now for only: $30.00
AMS Accucraft AC83 131 RGS Brass Caboose NEW 1203
AMS Accucraft AC83 131 RGS Brass Caboose NEW 1203
$229.99
Time Remaining: 26d 4h 3m
Buy It Now for only: $229.99
Bachmann BAC26565 On30 18 Offset Cupola Caboose DSNG
Bachmann BAC26565 On30 18 Offset Cupola Caboose DSNG
$44.84
Time Remaining: 27d 5h 17m
Buy It Now for only: $44.84
27714 Bachmann On30 Caboose PRR w Lighted Interior
27714 Bachmann On30 Caboose PRR w Lighted Interior
$39.99
Time Remaining: 28d 23h 16m
Buy It Now for only: $39.99

Other On30 Scale train items recently purchased through this site:

27714 Bachmann On30 Caboose PRR w Lighted Interior
Bachmann BAC26565 On30 18 Offset Cupola Caboose DSNG
AMS Accucraft AC83 131 RGS Brass Caboose NEW 1203
g Bachmann On 30 BOXED 27714 Caboose PRR Pennsylvania Railroad