What do you mean cheap? A real proper fibre laser welding machine will set you back 200,000 THB minimum (1500W), anything less than that is likely not a real laser welding machine.
I've had a few goes and they're great, but usually used for thinner jobs, laser will likely replace smaller TIG jobs, but MIG will still have it's place for welding thicker materials, anything thicker than 3mm will need MIG/TIG/MMA.
The 1450 baht pricing is only for the gun of the laser, it isn't actually the laser, it's like buying the MIG gun but not the machine.
@sometimewoodworker is correct you need to add up all the other parts too.
Real laser welding isn't going to be for household use anytime within the next 3 years, but maybe 7-10 years time we might see prices drop below 100,000 THB, but don't hold your breath.
MIG has only just started to come down in price for DIY use I would argue, TIG (proper TIG not the <deleted>ty lift-TIG) is still expensive both in terms of machines and consumables/fillers.