Where to buy large foam core board?

[paytonphoto]

I need some 4x8 sheets of white foam core I went to Hobbly Lobby and Micheal's but all they have a 3x4 sheets when I ask for something larger they look at me like I have lost my mind for asking such a ridiculous question. Does anyone know where to pick up locally in S.A.?

[pepper52]

Herweck's on 300 Broadway Street sells a variety of sizes of white and black foam boards. Call them at 227-1349 to make sure they have the size you need in stock. You may be surprised at the sizes they have stocked. I purchased my white and black foam boards from them.

[toverman]

Sometimes home-improvements stores also have it in large sizes, but not always in the color you want.

[Zack Davis]

You can always call your lab, sometimes it's at a premium but I know we got 1" thick 3x4 sheets of foam core from Millers a few years ago.

[sldi]

Home Depot insulation dept, white is like 13 bucks a sheet. I found it in different parts of the country but could seldom find it here in TX, its for insulation and the white styrofoam has very low R factor. If you look it up online and copy down the SKU number they can order it. 4x8 sheets.. most of the other stuff will be either pink or blue, or have silver paper on it