my gallon jug of gavilyte cost me $7...and in hindsight(no pun intended), i could have gotten away with maybe 2-3 pint glasses, especially after doing clear liquids the entire day leading up to it, but i suppose they want to make sure they don't get pooped on during the procedure...and actually as i got out of recovery, the first thing i did was check for 'dampness' in the back of my gown...it was dry...phew...