XT prices are as follows
28$ for 1 game, which includes game time, rental of the M15, 4 mags, and protective gear. Other guns have other prices
Have your own gun? 18$, which includes all the above, without the gun.
2nd 3rd 4th ,etc games in the day are half price. (which are as low as 9$ for someone with their own gun).
As per the static thing... the small changes affect the game play big time, so it rarely gets Stale.