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

Bachmann On30 o 4 o Porter WITH SOUND  Logging Mining cars
Bachmann On30 o 4 o Porter WITH SOUND Logging Mining cars
$325.00
Time Remaining: 5d 7h 19m
Buy It Now for only: $325.00
Bachmann Spectrum 28299 On30 0 4 2 Porter Stem Loco DCC Train
Bachmann Spectrum 28299 On30 0 4 2 Porter Stem Loco DCC Train
$97.75
Time Remaining: 25d 18h 46m
Buy It Now for only: $97.75

Other On30 Scale train items recently purchased through this site:

Bachmann On30 o 4 o Porter WITH SOUND Logging Mining cars
Bachmann Spectrum 28299 On30 0 4 2 Porter Stem Loco DCC Train