Newegg offers two HP 4.7GB 16x DVD-R Media 50-Packs (100 discs total), model no. DM00070B, for $11.99 with free shipping. That's $12 less than other stores charge for the pair. (For further comparison, we saw a single 50-pack for $6 shipped — the same per-unit price — earlier this month.)
Newegg offers the Ridata 4.7GB 16x DVD-R Media 100-Pack, model no. DRD-4716-RD100ECOW, for $19.99. Coupon code "EMCAVNR55" cuts it to $12.99. With free shipping, that's the lowest price we could find by $12. Coupon expires July 30.
Also available is the Sony 4.7GB 16x DVD-R Media 100-Pack, model no. 100DPR47SP, for $28.99. Coupon code "EMCAVNS26" cuts it to $13.99. With free shipping, that's the lowest total price we could find by $10.
Thinking of buying more than one 100-pack? Add two to four Sony DVD-R Media 100-Packs to your cart for $25.99 per 100-pack, after coupon code "EMCAVNS26" the per-unit price drops to $10.99. For an even larger discount, add five or more 100-packs to your cart for $22.99 per 100-pack before coupon, after applying the coupon the per-unit price drops to $7.99.