I am a frame builder AMA

This kit,

https://www.weldequip.com/oxy-propane-brazing.htm

Then spent about the same again on a 13kg Propane and a Hobbyweld Oxygen. Of course refilling them will be much cheaper.

I’ve also bought a pile of brazing rods - £20 or so, a sparky lighter doodah - £5, a tub of flux - £10, some shade 3 glasses coz the goggles the kit comes with are a bit crap - £10.

I also spent a couple hundred on practice tubes and lugs but that’s up to you...