Yes, it's a real thing. It'll cost a penny extra, but probably worth it. You can anything now adays, just looking for the right name and a vendor to sell it to you.

I don't know your climate- personally I'm leery of any wet wall facing outside, and typically there is a window over the sink too- so you'll have thinner insulation and the opportunity to freeze pipes in the wall (water /knobs are typically supplied via the wall).

All that said go to a kitchen/bath place and check out their catalogs.

I ended up buying an 'industrial' looking stainless steel tank paired with an industrial overhand nozzle. I had to butcher the countertop to get it to fit- there's only a couple of inches around- and there was a size larger than that. I personally love it- it's deeper than anything and so far is easier to clean, even if the kids have to pick up the grates.

Do what makes sense and go for it.