well heres my take on it... I lucked out with a free commercial chiller being tossed at work... BUT, you can easily buy a $50 craigslist window ac unit and remove the condenser, set it in a cooler full of glycol/water mixed (right now im only using water but just got glycol 2 days ago to add.) you then can use a $20 aquarium pump from harbor freight or online to circululate the coolant through the cooling coils or jacket. you will also need a temp controller like the $38 inkbird or a diy stc1000 build like I did.
I went a little more nuts and built a control panel with 4 stc1000+ units attached to 4 - $3 solenoid valves that are all plumbed into the same pvc manifold so whichever conical needs to be cooled has its own valve which opens and a common pump for all 4 pumps coolant through the manifold pipe causing just that conical or conicals that the the corespomnding temp controllers are asking for to have coolant flow. I also have 4 band heaters which plug in for each conical that I may need in the winter.
that said you could if your frugal control temps on one conical for under $100 bucks with the diy chiller or even cheaper if you just use frozen 2 liter jugs in an ice water bath for the pump... thats what many do but that method needs maintenance to swap out bottles every day.
Look at this Budget setup...
https://www.youtube.com/watch?v=OboSC4EI0vs
I bought the hose to try this for $10 here...
http://www.ebay.com/itm/330900552367?_trksid=p2057872.m2749.l2649&ssPageName=STRK:MEBIDX:IT
and used this insulation which is like 5 times more than needed for one conical its easy to install with foil faced tape and scissors.
http://www.ebay.com/itm/251905118937?_trksid=p2057872.m2749.l2649&ssPageName=STRK:MEBIDX:IT
these are the solenoid valves I used
http://www.ebay.com/itm/251775467278?_trksid=p2060353.m1438.l2649&ssPageName=STRK:MEBIDX:IT you do need a 24v dc for them though.
the real advantage to a glyol setup over a freezer conversion is expandibility to add more fermentors to the setup.