We paid about 700/night at the mgm for a terrace suite, though that is ab out as cheap as it will get. If you are getting married at mgm you get a chapel discount on rooms. I just kept checking the reservations site for them to open booking (they won't book more than 11 months out tops on the big suites)
We did end up picking outside catering from masterpiece cuisine, sooo much cheaper and my contact assured me they have had no issues bringing food in, the hotels try to discourage it because they want your money. We also plan to buy our alcohol at the liquor store to save money