JNArchKey

I'm looking for a keyboard or keypad under $40. I want to type special characters like these ° ¢ Ʃ Δ £ ‽ © for work using a small programmable USB keypad but all I can find are number pads that aren't programmable or expensive crazy looking gaming macro things. I can't code and don't want to have to memorize alt codes or install software that I'd have to open or go to a web page and copy paste I just want to tap a single key and have the symbol I want. Being able to label the keys and have double the use by holding shift or something would be bonuses