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

Bachmann On30 o 4 o Porter WITH SOUND  Logging Mining cars AND Camp Car
Bachmann On30 o 4 o Porter WITH SOUND Logging Mining cars AND Camp Car
$320.00
Time Remaining: 29d 5h 5m
Buy It Now for only: $320.00

Other On30 Scale train items recently purchased through this site:

Bachmann On30 o 4 o Porter WITH SOUND Logging Mining cars AND Camp Car