Kezivs via Amazon offers the Iain Sinclair Cardsharp 2.0 Folding Credit Card-Shaped Multipurpose Knife
, model no. 7223016412794, for $6.19
with free shipping
. That's the lowest total price we could find by $18, although we saw it in May for a buck less. (For further comparison, we saw it in August for free with orders of $10 or more.) It features a stainless steel surgical blade, polypropylene body, and built-in protective sheath.