that's a pretty sweet ideahmmm, if you marshall at a site (like i used to) then perhaps you could ask the owner if a group of your friends could come up, and that they only have to pay for paint, or get like a £1 off every 100 paintballs they buy? the site at which i used to marshall at let me do that one time, and they did come back and gladly payed full price
also bricketwood are doing a special offers for temas who train there get half the amount of a groups full cost if they organise it, so you can help them and get ££