I can't tell how much Bestbuy.com sells them for because their site is being updates right now... but as far as I can see you've got 3 choices in North America for cheap 8x DVD+RDL from Verbatim:
http://www.microcenter.com/single_produ ... id=0259490
Verbatim 8x DVD+RDL 15pc Spindle - $39.99 USD + Shipping
Should be about $45.98 USD + any sales tax the might be applicable depending on where you live and if Microcenter has a store there or not.
Shipping says 5-7 days, so I'm not sure they actually have them in stock... it's a VERY hard to get product!
http://www.ncix.com/products/index.php? ... omoid=1051
Verbatim 8x DVD+RDL 15pc Spindle - $38.99 CAD + Shipping
(on sale, regular price is $39.99 CAD + Shipping)
Probably about $51.80 USD
On the other hand, I know they have stock on hand, so it ships sooner.
(Can't tell their pricing because the online site is down currently).
You might have an easier time with availability with the Verbatim 8x DVD+RDL 5pk though.
Punch Cards -> Paper Tape -> Tape Drive -> 8" Floppy Diskette -> 5 1/4" Floppy Diskette -> 3 1/2" "Flippy" Diskette -> CD-R -> DVD±R -> BD-R
The Progression of Computer Media