I found this company that does t-shirts of whatever you want. I used them for my sister's bachelorette party and it turned out great! www.the4h.com
I only got 6 shirts and they said that even if I only wanted 1, they could do it. I placed my order on Saturday and had my t-shirts by Thursday with all of our names on the front (my sisters said "Bride") and the backs said "Bachelorette Party- Last Weekend of Freedom!" Everyone was congratulating my sister, it was great!!