Best $50 keyboard for gaming and everyday use?

The Logitech G110. It's arguably one of the best non-mechanical gaming keyboard out there. On Amazon, it's $60, so a bit more than what you were expecting, but that's as good as it gets before mechanical. If you're paying more than that on a keyboard, it's for some useless gimmicky feature, again unless it's mechanical, in which case it's worth every penny