Starwood Preferred Guest - Sheraton Imperial KL - discount certs, rates, help????

I normally stay with Hyatt (Diamond) but after hearing so much about this hotel, I've decided to book a stay there for 2 nights later this month. I have an Exec Suite at 550 MYR / night (not including taxes)... This appears to be a slight discount (30 MYR - about $8/nt) from the "best avail rates" since I can use a "govt discount". Does anyone know if there are any discounts available that may improve on this. I see a lot about the 50% discount certs for Amex Plat Holders but I'm not going to get the cert in time for my trip since I'm already in Asia now. I appreciate any advice anyone can give me. If it helps, I also have 1P (Prem Exec) status on United Air. Thanks...

The only thing I can think of would be the SPG 50% coupon but that would be at the rack rate. I stayed in a regular room and it was very nice for myself,the room was great ffor 68 us I figure your suite at about 144 dollars I would think it to be one of the nicest stays for the money you will ever see.