On February 3, 2018 at 18:29, tweeterguy said...
Regular: 418 MHz: example (MRF-350 and MX-990)
International: 433 MHz: example (MRF-350i and MX-990i)
Yes, you can buy the i series in ‘merica.
The 433 MHZ products are not legal to use in the US. You'll probably never get caught, though.