HELP URGENTLY WITH PROM TRANSPORT?

Okay, so my prom is on the 8th of July, and I haven't got any transport. I have been phoning up places, but they either don't have any available or too expensive for my friends. I need a price range around �30 - �40, per person, and something that holds 6 people, well no actually anything... as I'm so desperate. Thanks P.S - I live in UK - Southampton