These are excellent folding bikes, and they won't break the bank:
https://www.origamibicycles.com/
https://zizzo.bike/
They're in the USA, the companies are known for excellent customer service, and
Pinigis (the owner of Origami Bikes) is a forum member and answers questions quite quickly.
There's also Dahon, Tern, and a few more to choose from, all at various price points.
thorusa.com is the North American distributor/representative of Dahon bikes, and they're also quite good when it comes to customer service.