Buying wine--especially French wine, Super U

Cashing cashier checks--Do you mean travelers checks?? If so, a casino. For cashier's checks, no idea.

Fresh meats--again, Super U. 1 to 1 dollar to the Euro. Specials all the time, A couple of newspaper articles recently that state their prices are the best on island.

Buy gas--Huhm, I don't know. The price is fixed on the Dutch side, possibly on the french side? Not sure. In general, the cost is not enough in my standard stay to even worry about, versus the cost for other things... We fill up once and it costs $30 to $50. Nothing to worry about, in the scheme of things.