In case anyone wasn't aware the prices for Delta Force are £10 entry, £10 for first 100 balls, then £7 thereafter per 100. Or you can buy in bulk which makes it £6 per 100. These are prices on their site, there are no package deals on there. I'm aware you can save money by buying entries on ebay (8 for £3.50 - sounds great if only my friends had known).
Basic prices for Delta and Skirmish are £9.99 entry. A juniors deal price including 500 paintballs at Delta is £34.99, Skirmish have the adult deal with 500, or juniors with 550 at £29.99. (£5 more at Delta) The price per paintball equates to 1p extra at Delta - unless in Scotland with another 1p extra.
So Deltas prices are a bit more, but are not so excessively different. (You also get the novelty of a free delivered pizza as opposed to an on site cooked meal). Also just because deals are not shown on the corporate web site it does not mean deals won't be available on the day.
The pricing scales for paintball are:
Punters = core business for a site. The more paint bought the cheaper the rate.
FPO Walkons = Sometimes even pay full punter price, but tend to pay a lower paint price. This varies considerably, and may be as low as an entry green fee plus paint at cost.
BYO Walkons = Pay only an entry green fee
Events = Tend to pay a higher entry then a basic green fee to cover event costs and perhaps prizes.
Private play = paint at retail prices, air /co2 from own source, facillities / marshalls / insurance lacking.