$10 heating element, 2kW
$8 1gallon stainless steel pot, walmart
$35 in copper fittings and a 6-8 foot section of 1/2"ID tubing
$30 ebay PID controller
$15 RTD temp probe
$15 SSR, 40A
$10 other misc costs, solder,a piece of insulation, etc
plus a pump, hoses, and heatsink for the SSR if you dont have one (i did, so $0),
plus maybe 10 hours to put it together and test...
add maybe $250 if you need a pump, hoses, camlocks and ball valves... i already had those, so i didnt count em.