At the MOST, a 25 litre HDPE bucket with lid is $25 and a tap $1.48 from Bunnings, food grade hose, $2 per metre (2m reqd). Hardware stores sell various HDPE packages for less than that. I've seen 25L fermenters sold as "dry camping storage containers" at Bunnings for about $15. Complete with O-ring. Exactly the same vessel that Jad's homebrew kits used to ship with. Just twist out the bung and twist in a $1.48 tap. If you can't afford $16.48 to make ALL OF THE REST OF THE BEERS THAT YOU WILL EVER BREW better, then you should get used to yeasty bottles with random priming.
What I used to do back in the "2 bucket" days was ferment in A, rack to B for a week or 2 then rack back to A for bulk priming and bottling.