The only options you have at this time are to purchase CS6 from some aftermarket source, like the auctions, which is very risky, to subscribe to creative cloud, or to purchase a perpetual license for CS6 directly from Adobe, at full price. This last option can only be done on the phone with customer service. See Creative Cloud now includes Creative Suite Master Collection and Design Premium features
I don't want to be on the cloud
The subscription doesn't force you to use any cloud services. The applications still get installed locally and you only need an internet connection to confirm the subscription once a month or to perform any upgrades.