You might try searching for topics like: "RV stainless kitchen sink" on EBay or Amazon. Here's just one of the many I found with a quick search:
https://www.amazon.com/ZUHNE-Single-...gateway&sr=8-7
Without knowing the exact size of your sink cutout and not knowing your preferences, it's impossible to "pick one you'll like" but many are available for you to choose.