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Hi there. I too live in SoCal and have been down this path before and followed the issue on several other forums too. You may find a insulation supplier here or there that even knows what you are talking about and about 1 in 10 of those might actually carries some, but only the 1" thick variety and even then only in the 2' x 8' sheets (not 4' x 8') for like $18. I even found a Home Depot (in San Bernardino) that had 2 very old ,ratty/destroyed sheets of the 1" x 2' x 8' pink foam and they wanted $20 LOL Since I want the 2" boards and prefer 4' x 8' sheets, the cost of using these would be around $80 for the equivalent. Needless to say, I didn't buy any pink or blue foam. That's just the way things are in So Cal and the pink and blue foam. An alternative would be to use the J-M foam boards which are Extruded, available in 2" thicknesses, come in 4 x 8 sheets, cost $16 ot $20, and are readily available in the Home Depot's and Lowe's in SoCal. HOWEVER, they come with foil faces that you will have to peel off - a real pain in the rear!! After peeling it off of about 2 sheets, you'll get the hang of it and it will go much faster after that, but, the first few sheets will be a very time consuming learning experience. An added advantage to using this stuff is that the foam is a sand color, so if you are modeling the So Cal or desert areas, your base will already be the right color. I had an absolute need to keep my layout as light as possible yet as strong as possible, so I am using the JM foam. If you don't have a critical need for keeping your layout light weight, don't even bother looking for foam here and use plywood and hydrocal or sculptamold. Best o'luck to you. Greg
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