I believe the XT8 dob comes with a moon filter. If not, you'll probably want one, the moon is really bright at low magnification.

Edit: Looks like the XT8 currently ships with a 'bonus accessory pack' so you get the deepmap, a right angle finder, and a laser collimator free. No moon filter though. On the accessories tab, the moon filter listed there for 15.95 should be fine.