NewEgg is a very reliable source of Verbatim AZO brand. If your backing up data I'd go with the DVD+R's. For video and other use go with -R's. It's helpful to buy them when they go on sale and/or with coupon codes. Also recording at 8x vs 16x improves scan qualtiy for some burners even if the media is rated 16x (may not be the case with a burner made after 2010, or has less than 800 discs written/attempted).
Ex. Verbatim+R/-R AZO 100 packs: all-time low price $14.99, high price $28.99 (but usually found @ newegg somwwhere between).
There's been some debate about whether Verbatim AZO's or Ty/JVC premium will last longer under equal storage conditions. Then you ask yourself is the extra $10-$25 worth what your putting on the discs?