Tilly’s Very Bad Day is available free for Download (PDF). Some some people will want a paper copy. Here are three options: print and staple; print and bind; lulu print on demand.
Print and staple
The cheapest approach is to make your own book.
To staple your own:
Step 1: Download Tilly’s Very Bad Day (PDF) Step 2: Staple together. You’ll need a chunky stapler.
Print and bind
The next cheapest is to print the rules yourself and then get them commercially bound.