I came across a rubber carving block that I bought when we lived in Nevada...I had bought it, it promptly broke in 1/2 ,( of course I didn't toss it) ...Anyway, I ran into it again and carved it up with my lino-cut tools! OH! It cuts, as they say, "LIKE BUDDA"! I was so easy, smooth! I am hooked... I have already bought and carved another couple of pieces!
They are made by speedball (http://www.speedballart.com/) And I bought them at Michaels. here is the direct link to the product (http://www.michaels.com/art/online/displayProductPage?productNum=fa0410)