I loved Battlezone when it came out in the 1980s. I just discovered yesterday I could play it online via my PC. I have to use the arrow keys and space bar to aim and fire. I'm looking for a joystick with a usb that I could use. Any suggestions on joystick/controller that will work, and where to buy it?
P.S. I can't wait to get higher scores using a joystick.
Welcome to AtariAge!
When you say "play it online," I am assuming that you are using some sort of browser-based emulator. To the best of my knowledge, emulators which run in the browser do not support joystick or controller input.
I don't know how much you've looked into other emulation options, but these days it is very easy to play Battlezone (and just about every other classic game) via emulation under any modern desktop operating system. If you prefer the arcade version of Battlezone, look into MAME; if you prefer the 2600 version, look into the Stella emulator. If you'd prefer not to procure the ROMs and configure the emulators yourself, there are also commercial emulation options which offer more of a turnkey solution, such as the Atari 80-in-1 Pack for Windows (which includes both versions of Battlezone).
Once you get one of these emulators working, you'll have the freedom to use the controller of your choice. Any controller supported by your operating system should be usable by these emulators.