Pattya is not Pattani.
Pattanni is on the South West Coast, Pattya is in the Center Gulf on the East side.
Singha costs about 65 baht at the 7-11. In a bar it currently goes for 85 baht durning happy hour, but more like 100-125 baht normally. Chang and Heiniken are about the same.
85 baht is $2.50 @ 34 baht to the US $1.
Right now the exchange rate is 33.8 Baht to a dollar.