BuyDig offers the Samsung 16GB Class 6 microSDHC Memory Card 3-Pack, model no. E2SAMMSDHS16G6C, for $17.99 with free shipping. That's $6 per card, $4 under our April mention, and the lowest total price we could find by $9. Each card features a data transfer speed of up to 24MB/s.

Also available is the Samsung 16GB Class 6 microSDHC Memory Card 4-Pack, model no. E3SAMMSDHS16G6C, for $22.50 with free shipping. That's $5.63 per card and the best per-unit price we've seen. (It's also a current price low by $13.)