USGI MICH TC-2000 ACH Helmet Cover Digital Camo Woodland #A
[AS1084]

Super low price, and fits the MICH like a glove. It doesn't exactly match the color scheme of MarPat, but it's close enough that nobody will notice unless they're looking for it. Plus, they tend to ignore color schemes when you're pointing a weapon at them. I would recommend buying this if you want to complete your U.S. Marine loadout.