HaWaTour Global via Amazon offers its HaWaTour RFID-Blocking Stainless Steel Credit Card Case in Black or Silver for $8.99. Coupon code "336SYIC4" cuts that to $4.94. With free shipping for Prime members, that's $4 off and the best price we could find. It features eight slots. Deal ends June 30.

Note: The code also drops the business card holder to $4.94 with free shipping.