Have you tried places like Lowes or Home Depot? They usually have catalogues of things not just on display, and while you might pay more for a 'different' or custom sink, you are more likely to find what you want. A couple of years ago I wanted a little sink (very little!) to replace one in a teeny bathroom, and after Googling a bit, found many places to look (order from) and ended up with a very cute one made in France, being sold in NY by some company... for more than I might have paid at H-D, but not hugely more, and it looked terrific!

I'm a lousy shopper. I have looked at home depot, lowes, and through the catalogs at my local aces hardware store. No luck yet.

Look at laboratory sinks.

Here is a link that might be useful: Sink