After finding the 7-Eleven located at 601 Penn Avenue closed after 10:00 pm one evening - I made my way a few blocks away to this 7-Eleven on Liberty. Thankfully - they were open later.
Unbelievably - just like the 7-11 at 601 Penn - this one also had an AC problem. Again I asked the guy working the counter about it. He said it was broken and he was planning on e-mailing someone about it - he said it was over 85 degrees in there. I believe it.
Again, no Amex accepted. Cash, Visa, and MC.
I got what I needed and got the hell out of there.