Walmart offers the Kingston 16GB Data Traveler USB 3.0 Flash Drive, model no. DT100G3/16GB, for $5.99. (Amazon charges the same for Prime members.) Opt for in-store pickup to dodge the $4.97 shipping fee. That's the lowest price we could find by a buck and the best deal we've seen without rebate hassles.
MacMall offers the Kingston 128GB UHS-I Class 10 SDXC Card, model no. SD10VG2/128GB, for $55.99 with free shipping. That's the lowest price we could find by $39. It features read speeds of up to 45MB/s.