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

On30 5 Ton Wooden Hopper Car Prairie Locomotive Works NIB
On30 5 Ton Wooden Hopper Car Prairie Locomotive Works NIB
$39.99
Time Remaining: 7d 4h 55m
Buy It Now for only: $39.99

Other On30 Scale train items recently purchased through this site:

On30 5 Ton Wooden Hopper Car Prairie Locomotive Works NIB