There are some sellers on Amazon selling it for $69.99
http://www.amazon.com/Dark-Souls-Black-Armor-Edition-PlayStation/dp/B00F6YD2AK/ref=sr_1_1?ie=UTF8&qid=1394642464&sr=8-1&keywords=dark+souls+2+ps3+black+armor+edition
As far as I know, the PS3 will still support PS+ well after the release of the PS4. The service mainly goes by whichever system your account is on.
Don't quote me on it though....