Originally Posted by radonc1

I suggest you tread lightly on that as well. We don't have good DPs that Amex is actually still allowing GC purchases in other venues.
I did a quick check of a small ($600) GC purchase at Staples with Amex for Hilton and it did go through 1 month ago but that does not mean that they will permit large purchases. Just let us know how you fare with your Amex cards at supermarkets.