I doubt that you will find any sink at a big box store. They are usually residential sinks, much large and have the faucet on the back deck of the sink itself.
I believe you will have to be looking at RV supply places for a suitable sink. Another thing to consider is to replace your existing countertop if you find a sink which is close but will not exactly fit into your opening.
If you have an Ikea store or go on line to Ikea, they have some interesting sinks, and some are smaller and don't have the faucet deck.