My walker has that. The one you posted can be bought at a pharmacy and I think needs to be self assembled (maybe not), but the one I have cost $350. It wasn't funded. It's super solid - has rubber tires with treads - has had a ton of mileage and is still fine except one handle grip is cracking from me gripping and pushing down too hard - and has a seat and basket that carries a lot (it's amazing, it's been like a pack horse for me) - and it folds. I like it, but for the back and shoulder pain I've acquired. I will still use it sometimes.
My scooter got special funding. It was cheaper than the ad I posted but still an expensive bit of equipment. I've been a little hard on it while learning, so I need to be really careful. It's not as easy as you'd think getting into and out of tight spaces. That's the only problem I have riding it. I'm fine otherwise. I can take tight corners, just not in tight spaces!
I just got home and bashed into the wall taking a tight turn from the door into my room. Nothing harmed except I chipped a spot of paint on the wall.

Oops. I don't want to damage the house. I was going as slow as possible, then a back wheel got stuck on the doorway lip while it was turned and I had to turn a little, back up, and go forward, then it lurched as it got unstuck and I bumped the wall. I think I can fix that spot with a dab of filler and paint though (about the size of a quarter in diameter). I need to get better at this. There's nowhere else I can bring it inside - especially where it's not obstructing a doorway, and I don't want to leave it outside.