as fumps said really, take your time and hire or buy what you need, I wanted my own face pro but I knew the 1st game on the stag do wouldn't be my last so I was equipped before the day!
1st game - khaki combats, black jumper, mesh googles, half face pro, cap....hire games, M4
2nd games - coyote combats, mtp smock....it was a rather warm day though but pockets were useful for carrying the several containers we needed to collect!! - hire game, new ICS M4
3rd game - camogrom combats, coyote ubacs, 901 chest rig cap and or fast helmet, 6 mid caps, ICS CXP UK1
ok I had the clothing from general use and had time to get things between 1st and 3rd game, 4 months!....but it costs, went for discounts when they came in via email and did plenty of research.....it and wont stop there!
there is probably no real figure to give you as it can vary so much, hire for the games you need ,some sites may allow you to buy ready for your 3rd game, but that's site specific I guess, I reckon ive spent around £1.......whats that dear, eeer yeah hang on.....she'll kill me, like SD, my wifes not gonna be to happy if she knew the real cost.....so I times it by about 0.00001!!!