We've searched the internet and found the largest collection of On30 Scale trains for sale is on eBay. Below are the listings for 'K-27'.

BLACKSTONE MODELS HOn3 B370101 Snowplow Assembly for Blackstone K 27
BLACKSTONE MODELS HOn3 B370101 Snowplow Assembly for Blackstone K 27
$26.99
Time Remaining: 2d 23h 29m
Buy It Now for only: $26.99
BLACKSTONE MODELS HOn3 B370111 Road Pilot Assembly for Blackstone K 27
BLACKSTONE MODELS HOn3 B370111 Road Pilot Assembly for Blackstone K 27
$26.99
Time Remaining: 2d 23h 38m
Buy It Now for only: $26.99
BLACKSTONE MODELS HOn3 B370112 Switcher Pilot Assembly for Blackstone K 27
BLACKSTONE MODELS HOn3 B370112 Switcher Pilot Assembly for Blackstone K 27
$26.99
Time Remaining: 2d 23h 42m
Buy It Now for only: $26.99

Other On30 Scale train items recently purchased through this site:

BLACKSTONE MODELS HOn3 B370101 Snowplow Assembly for Blackstone K 27
BLACKSTONE MODELS HOn3 B370111 Road Pilot Assembly for Blackstone K 27
BLACKSTONE MODELS HOn3 B370112 Switcher Pilot Assembly for Blackstone K 27