Wireless routers with wired ports are very common. These are actually routers with wireless access built in. But are exactly what you are looking for.
Almost any brand will do the trick. Linksys, D-link, Netgear, Buffalo, etc. Your choice.
I doubt you will find one with only two etehrnet (wired) ports. I think 4 minimum is the least I have seen. You shoul be able to find one well within your price range. Actually for less.