@Wolfshanze:
I went to the Shapeway site, and those factories were nowhere close to 10 for $12 if that’s US Dollars… they were much pricier when I looked (Dec 2016).
I thought the price might have increased, but I just went there and the ones I ordered (from eBard Models) are $12 (US Dollars) and you get 10 in the 3D print. I ordered 10 regular, white, two stack factories to represent the minor ones and I ordered 10 black, four stack factories for major.
I’m currently finding Ebay prices of original industrial complexes such as 11 for $9 or 12 for $8, so I’d probably go with Ebay prices if you’re looking for original pieces. I just personally liked the idea of getting two different models from Shapeways in two different colors to differentiate between minor and major.