Honour what you said mate
I myself have been took by something similar recently by someone on here and i was very pissed off....
The guy had something up for sale. I mailed him and asked what he wanted. He told me a price and i said YES, i will have them. 10 minutes later he mailed me back and said someone else had offered more money and he is selling them to him........
Now if the guy had asked for offers i would of given him good money, but HE told ME what HE wanted and i said yes....
Missed out on the England game at Wembley because of it