Poweradd Travel Power Adapter Kits – Dual 2.4A USB Ports + 2 Outlets Wall Charger with Worldwide Wall Plugs – $16.99 AC Free S/H with Prime

PoweraddDirect via Amazon has universal power adapter on sale for $16.99 after coupon.
For UK, US, AU, Europe & Asia.
Build in protection and 2 USB charging ports. Claims to be UL listed.
https://www.amazon.com/gp/product/B014SII7FO
1200 reviews, 4.5 stars.
Use 4X37Q7XL coupon at check out.