Sorcha, red chipotle- powder or whole at Los Chileros de nuevo mexico.

Chipotle

Main website: www.888eatchile.com

Haven't bought anything from them for some time, but their product was good then. As you say, expensive- $5.60/3oz or $17.00 per pound, which isn't bad.
I used to get blue corn from them for posole, but they no longer carry it.