Playfelt - have you considered just emailing your info? I used to give them a package at each interview as well, but was going through reams of paper, envelope, and ink! Now I email it and tell them, when they say they want the spot, to bring a signed copy of the agreement and a deposit cheque with them, then photocopy the lot so we each have one. So far, it works wonderfully and I've not spent a penny on paper/ink/manilla envelopes that I didn't have to.

It's a small thing, but paper and ink are freakin' expensive!