Cpps entry prices for 2017 are here:
http://okpb.co.uk/#/news
Breakin / break out are the entry level tournament at £225 per team, which is £45 each for 5 people, or less if you have spare bodies to rotate
Then add paint
It is 5 man format for breakin/break out, and I believe it's M500 in which you would have 2 pots & a hopper per game
(Probably 2500 paintballs)
You won't shoot all that paint for every player
Ensure you have £500 for the team, pay your deposit / game fee at the start and if you have a reliable person who can count then get them to hold the cash
Once the day is over and you have the final paint bill clear that and dish back the change
Alternately put together a team account, everyone pay in x amount and then during the year carry the balance over, either to make things cheaper later on or to buy team assets such as bulk buy pots, a virute clock chrono etc