i don't know where to get it locally unless you can find someone who's got a remnant. i've got a small piece, but i have to 3 meshmods with it, and i doubt that i'll have enough to complete 2 of them.
there are some of the reef supply sellers who sell enkamat by the sheet, and there are also guys on ebay who sell 8x11 cuts from a larger sheet for about $7 or so. that might be your best bet.
maybe Poo-Tang knows another source. Joe?