That depends on how good of a shopper you are, and how handy you are at D I Y projects, if you are "deadly" on Craigslist finds, etc.....
Just a WAG here, but since you have a freezer you can use, you could PROBABLY, come up with all you need to have a BASIC keg system, in the 200 dollar range.
I asked your location, 'cause I could make ya' a hell of a deal on a used pin lock keg IF, you were in my area.
'Cause I ain't emptying, and cleaning, and shipping one!