A nicer two beverage cooler setup can be built for substantially less using industrial yellow Igloo beverage coolers from Zoro Tools (the cheapest source on the Internet plus free shipping), stainless ball valve assemblies from Bargain Fittings, and a very nice 16% open space false bottom from Adventures in Brewing. Unlike modern Rubbermaid "McCooler" beverage coolers (the older Rubbermaid Gott coolers were heavier built), yellow industrial Igloo coolers do not warp or crack when used to hold hot liquids.
I recently built a custom 3.5 gallon brew house using two 5-gallon industrial Igloo coolers and the hardware mentioned above. I did not penny pinch, and the cost to build was around $160.00. The false bottom assembly used in the build cost me around $40.00 with shipping. A braid can be installed for far less if one is batch sparging. The entire brew house fits on a card table.
The kettle is completely custom. It started out as a Vollrath Optio 3506 27-quart stockpot (this stockpot was selected because it is induction ready and has a 1:1 height to diameter ratio). The nipple was welded by a local sanitary welder. NorCal fabricated the false bottom to my specifications. I cut, bent, and flared the pickup tube. I also drilled the pickup tube hole in the false bottom (I originally had the false bottom sitting on a stand). I use a false bottom in my kettle because I use whole cones exclusively. A false bottom, whole cones, and immersion chilling leads to clear cast-out wort.
Edit: The cost to build the mash tun and hot liquor back was around $160.00. The kettle cost substantially more than that figure to fabricate.