I admit, I get mine in bulk on eBay. My price point is $4 - $5 per pound, shipped. This is a good price, for example.

Cutting the big blocks is a PITA. I have a Modified Presto Pot melting pot that I use to melt the big blocks, and pour them into little blocks. A bit of a pain to clean, but you can be creative.

I want to get a hot knife to try and see if that works. You'd still have to watch the temperature so that it didn't set a fire, and have a drip catcher underneath, but...