We've searched the internet and found the largest collection of On30 Scale trains for sale is on eBay. Below are the listings for '2-4-4'.

bachmann spectrum on30 NEW 25478 2 4 4 Forney DCC
bachmann spectrum on30 NEW 25478 2 4 4 Forney DCC
$340.00
Time Remaining: 4d 10h 22m
Buy It Now for only: $340.00
Bachmann Spectrum on302 4 4 Forney DCC  Sound
Bachmann Spectrum on302 4 4 Forney DCC Sound
$249.99
Time Remaining: 6d 6h 27m

Other On30 Scale train items recently purchased through this site:

Bachmann Spectrum on302 4 4 Forney DCC Sound
bachmann spectrum on30 NEW 25478 2 4 4 Forney DCC