I know typically you must be within 2 years of ETS before you can reenlist, but is it possible to reenlist before that (Even though you are not deployed?) I am tryng to reenlist for an OCONUS slot, but my window doesnt open until January....do I have to wait???

If you come down on orders and you do not have enough time left in the Army to meet the SRR (Service Remaining Requirement), then you can reenlist outside of your window.

Other than that (above), you'll need to wait until your 24-month reenlistment window opens.