Great work tagging, to all! I need to get some cards as well. Matt - it is obvious you have a marketing affliction. Great work sir! (and hope that Michellle is doing well also).
On the shirt side - my $.02 : I prefer T'shirts that are better quality (think Beefy T's) shirts with a nice color chest logo and a full color logo on the back. The price will be slightly higher, but they last much longer. Oddly, I've recently collected some really thin (dont know how the quality will pan out) shirts latley - more retro style super soft T's..... there are plenty of options. White T's are normally the least expensive, but light gray shirts have a nice advantage of not showing sweat as quckly... It gets hot in a 40 with no AC.....
Additionally, embroidered shirts can be nice also. I often buy my colared golf type shirts from Marshalls or Kohl's and have a local embroidery shop stitch them for me. Once the basic design is setup - i take in the shirts I want and can have some very nice - very custom shirts, windbreakers, bags, anything else embroidered. I've mimic'd the Boeing style shirts, with sleeve embroidery also - we use the marketing company, Boeing & I.
The Vistaprint is a great option, but if we want to compare pricing, I have 2 very close local vendors that work together with creating artwork, screen printing & embroidery work. I'd be happy to assist when the time is right to do some pricing for shirts, sweatshirts, windbreakers, jackets, etc....