True, K4 has both their own website and an eBay store.  I purchased two sets directly through their website since I'd rather support them that way-- fewer "deductions" if you know what I mean.   There is a discount on multiple decal purchases and free shipping when using their site.

I have used some of their alphabet decals recently, and I'm pleased with the result though it's not challenging-- white decals on a black wall.  It's also not on a freight car so I'm stretching a bit...

Cheers,
George Irwin