any 4amp drivers 4 sale

Hey guys im looking to find or build a single driver that puts out very close to 4A-4.2A any ideas where i can find a single driver or parts to build one ?

Buy a Nanjg 105c and stack 4 extra chips on the back and that will give you 4.1 amps. I was going to make some to sell until my good soldering iron broke.