I do not know if this question relates to this division and would appreciate if it would be moved to proper division. I want to buy a piece of fine, pure, highly doped semiconductor with dimensions approximately: 7 cm X 7 cm X 1 cm (2 in. X 2 in. X 1/2 in.) It supposed to be just fine and well polished piece of material without any electronic components. In which type of stores it is best to look for? No online trade or stores please.