MoneyGram lists 4 different "Amex" options for Bill pay here:
https://www.moneygram.com/wps/portal.../home/paybills
Amex Citibank 2-3 day
Amex Gold 2-3 day
Amex Platinum 2-3 day
Amex Standard 2-3 day
Anybody use these to successfully pay an Amex bill at WM? How much more expensive is MoneyGram than CheckFreePay?