I was thinking:
A) Get a top-level domain such as .net or .info?
B) Get a country code level domain such as .us or .cc?
C) Lookup the information of the current owner and try to buy it from them
D) Keep the same name but add something to the end of it, e.g. "burgersapp.com" instead of "burgers.com" (if it's an app for burgers)
E) Think of a different name for your product
F) Something else (please explain)