Your post is full of errors:
handheld lasers are measured in milliwatts mW , not megawatts - Mw
Any Chinese company offering to sell a 1000mW laser for $20 is selling a 100mW fake. An actual 1000mW laser will cost at least $70.
The most powerful handheld diode lasers are blue/purple 3500mW, which cost somewhat over $200. Any company offering lasers over 3500mW are selling fakes.