We've searched the internet and found the largest collection of On30 Scale trains for sale is on eBay. Below are the listings for 'on30 ore car'.

Other On30 Scale train items recently purchased through this site:

O On3 On30 WESTERN SCALE MODELS M 1 3 WORKING MINE ORE CARS 2 FIGURES KIT A
O On3 On30 WESTERN SCALE MODELS M 1 3 WORKING MINE ORE CARS 2 FIGURES KIT B