South Korea was in talks to select either the AH-1 or the AH-64 a few years back, and took the Apache.
Australia was also considering the AH-1Z, but with the Big Green bird.
Same with Poland in 2022... but went w the 'pache. Too bad since the Czech air force has Vipers, you'd think Poland would want compatible copters that their geographic neighbor has. It would have been a large order, about 60 + airframes.
And Romania was supposed to get the Zulu, but that's still in talks.
Slovakia, or Slovenia, was in talks but nothing as of yet for used airframes.
Good thing is that Bell won the FLRAA which will be a windfall for the company. They would have won FARA as well but.... the successor to the AH-1Z, the Model 360 Invictus won't ever see production now.
At least Nigeria is about to buy some.