Logitech G300 is really good and cheap, but I suggest u the G300s
Also, if u want around a dozen of buttons, try "Gigabyte M8000X High performance Laser Gaming Mouse" for a price at 42 euros in Greece (around 35 in other european countries). You can also chose "Gigabyte Force M9 Ice" mouse. It costs ~32 euros. I own it and I suggest it to u with closed eyes, but is has only 4 buttons.