Retail
Letterman Marketing @ PSJ 10 (Opposite Sunway Pyramid)
Accepts AMEX.

Went to redeem travel bag using my MBB treatspoints, but found out they also accept Amex. Best part, point deduction system is flexible .Apparently the number of points they redeemed can be adjusted with a conversion of 200pts=RM1, and it doesn't have to be fixed as shown in the treatspoints catalogue.