Partyguy has a good sugestion

personally I think your best bet is to go stand infront of a headshop and wait for someone who looks like a stoner, then ask them to buy you a pipe just make sure you are fairly sure he/she wont rip you off, I used to do this all the time for cigarettes, you would be surprised how many people no matter how "straight" they look will buy a kid cigaretts lol