Old Navy: $5 Swanky Tanks This Saturday + 30% off Coupon!December 3, 2010 by JennieThe links in the post below may be affiliate links. Read the full disclosure.PrintEmailOld Navy is having another One Day Wonder sale this Saturday. They will have their Swanky Tanks on sale for $5! You can also use this 30% off Old Navy coupon to make them just $3.50! (Thanks Tanya!)Like most of their One Day Wonders these might sell out quickly, so make sure to get there early.