If you want TRI-X, pick up some "Arista Premium 400" from Freestyle:

http://www.freestylephoto.biz/192364...-35mm-x-36-exp.

$2.89/36exp roll

Same stuff, just a different name on the box, and no 400TX on the film rebate area
I buy mine there usually 50rolls or so at a time 2-3x a year.

-Dan