Lol, you could just email the support at each merchant and say that you were going to buy whatever the most expensive item they have, but you only have bitcoins to spend, so you are going to have to buy it somewhere else that accepts bitcoin. Haha
I think this opinion here is great. Direct to the point and straight conversation with the support may help each side underdtand each other most especially accepting Bitcoin payments to merchants that we eould like to purchase and try to buy or pay for goods and services they offer. I would like to do the same thing in the future with my Bitcoins as for me it is the most convenient way of paying online.