we have that paywave/paypass system here, it scares me a bit, no authentication at all and you can spend $100 each time with no verification
i thought i'd lost my wallet once and just the thought that someone could just take the card and wave it at a machine for just under $100 each time.
I've been trying to find a card without that function or at least with an easily identifiable chip so i can put a drill through it but my bank doesnt have different cards.
might need to just get a prepaid and keep what i need on it, or like you said just use cash.