Naples Florida Above Ground Pond

Hoping someone can help me- I'm interested in building a square or
rectangular pond on my pool deck. I just moved to Naples Florida. I'd like
to find a pre-formed tub and build a face for it. My problem is where to
find a large tub in the area. Any suggestions? Also, has anyone built one
of these on their Lanai? My vision is something Meditteranian looking,
maybe tiled on the outside, with a simple water feature.

Thanks,

Vince