Shop4tech.com knocks 20% off a selection of ink and toner via coupon code "INK20". That's tied with our mention from a month ago as the best percent-off discount we've seen from Shop4tech.com on these items. Plus, many items qualify for free shipping. Choose from compatible Canon, Dell, HP, Lexmark, Sharp, Xerox, and other compatible inks and toners. Deal ends May 22.