Trials of the Grail can be purchased either in pdf format for 6 USD or in print for 12 USD. The print copy is an 8.5x11, perfect-bound book.
Both versions are available from lulu.com:
The pdf version is also available from RPGNow:
If you'd prefer not to use either of the above services, you can purchase TotG from me directly via PayPal, but it will probably take longer.