Does it call for a particular type of grain?
There are plenty of hombrewers on here (myself included) but for for the small amount you probably need you may be better off just hitting a homebrew store and buying some crushed grains. Steep them at 150ish for an hour and drain.
Voila, spent grains! 1lb of base malt should run ya $1.50 max.
Though if you want to avoid this, I'll let ya go nuts on 10-20lbs of spent grains next time I brew
Jamie