I use Arista (Freestyle) and Inkpress as drop-in replacements for Pictorico.
These all work great, but I like Inkpress the best because it comes in lots of sizes, is cheaper than Pictorico, and especially because they package 8-1/2x11 in 50 sheet boxes. You will burn through a lot of fim while learning to make digital negatives so 25 sheets will not go very far, even though you can print several step tables on each sheet of film. There are other less expensive films that can work (Canon Transparent Clear Film, Photowarehouse Crystal Clear Inkjet Film, ...) but are not as easy to use because they don't hold ink as well, or are quicker to show pizza wheel marks.