I recently purchased a LED light from eBay and when the package arrived the following coupon came with. I bought a 21w B22 bulb for $6.27 on eBay and I can get the same bulb directly off their site for around $4.89 once the coupon code is applied. Plus you have the option free or paid shipping, whereas on eBay only free shipping is available for just about all LED light bulbs and therefore a 3-4 week wait.
A plus is that you can pay via PayPal.
They claim this on their website regarding warranty:
Return & Warranty
1.All of Our Products We offer 3 Years Waranty and money back guarantee return policy.Most of the time .Buy only need to provide photos or videos .we shall do the replacement or refund . no need to return the item back .
Listed end date for the coupon is 31-12-2016.
I'd be wary of these. I looked at some reviews on Amazon where Ranpo also sell and there were quite a few happy with the bright output but also quite a few that had the lights fail after only a few weeks/months. Comments about quality of construction (physical and soldering).