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

Other On30 Scale train items recently purchased through this site:

Narrow Gauge Classic DRGW 1 4 Scale 2 Stall Engine House San Juan Engineering
On3 On30 CRAFTSMAN SAN JUAN ENGINEERING DRGW 2 STALL ENGINE HOUSE KIT UNSTARTED