L11 gives us a good crash course above, especially in regard to sizes. I know there are adults who play and like sopranos (small ukes) and concerts (medium), but I can’t properly place my fingers on frets so small. So I play tenors.
A lot of the cheap stuff on Amazon is just junk. You might find yourself spending as much to have it “set up,” (make it playable) as you paid to buy it.
For something like $129, you can get a Kala KA-T, a laminated tenor that could keep you happy for quite a while. I must admit I’ve bought several since my KA-T, but it’s still a useful instrument.
If you want advice on brands, sizes and more, check out the forums at ukulele underground.com
Meantime, I’d love to cruise with the Elia crew some day.
Jim