Amazon has David Seeds Jumbo Sunflower, Original, 5.25 Ounce (Pack of 12) on sale for $9.96 when logged in to Amazon and check out via Subscribe & Save
Add-on but Shipping is free while Subscribe and Save is available
S&S pricing is
$9.96 1-4 S&S items= 75c per bag
$8.91 5+ S&S items =83c per bag
Deal may last only a short while.