chicken waterers needed

Hello all. I have a chicken flock of about 50 chickens. I have one five gallon fountain waterer. Although this is efficient for flocks of about 20 birds, i am filling this up more than once a day, and it is consuming extra time i do not have as a student. I was looking into waterers that hold larger quantities of water and found this one through farm tek, it is a 20 gallon poultry and small animal waterer, but the killer is, it costs $150. i was wondering if any one knows of someplace where waterers can be purchased for cheaper than this? any info is always helpful, thanks.
http://www.farmtek.com/farm/supplies/prod1;ft1_livestock_equipment-ft1_livestock_watering_equipment;pg106141.html

hunterboy725 why don't you put out more of the 5 gal ones. Here's a link on how you can make your own http://fowlfacts.proboards40.com/index.cgi?board=ffanswerstoquestions&action=print&thread=1014

MollyD

THANKYOU SO MUCH! this site is perfect! thanks alot

Andrew

You're welcome!

MollyD