Amazon offers its Prime members the Belkin SurgeMaster 6-Outlet Wall-Mount Surge Protector for $8.45 with free shipping. (Non-Prime members can qualify for free shipping by spending $35 or more; otherwise, shipping adds $5.74.) That's the lowest total price we could find by $4. It features a 1,045 Joule energy rating, LED indicator, and $50,000 connected device warranty.
Monoprice via Rakuten offers the Monoprice 12 Outlet Power Surge Protector with 2 USB Ports for $31.99. Check out with V.Me by Visa to cut the price to $21.99. (If it doesn't show this price, you may need to apply coupon code "VMEDEALS".) With free shipping, that's the lowest total price we could find by $16. It features 4,230 joules of protection.