Hey Matt,
I know a fellow in Oshawa with a block bored 20 over and a crank 10 under. It's a D2AE-CA block with 2-bolt caps ... I'm pretty sure it was drilled and tapped for 4-bolt caps though.
When I was talking to him in the fall, I think he was looking for something in the $4-600 range (don't know if that's good or not).
Note, he winters down south, so if you have a need for it before the spring, it would be a deal brokered through one of his sons.
2nd option - Kijiji ... there's a guy in Mississauga with blocks for $150 plus $100-175 for the crank (so ~300ish)
http://toronto.kijiji.ca/c-car...V-W0QQAdIdZ521102081One or two others on kijiji, but they are more than just the block and the price goes way up.