Amazon currently has the Anker PowerPort Qi 10 wireless charger on sale for just $14.59 when you clip the $2 coupon on the page (right below the price). That makes this a really great price for this Qi wireless charger, considering it is usually around $20, and was already marked down to $16.59.
This wireless charger from Anker is a 10W charger, which means that it does support fast wireless charger for Samsung devices like the Galaxy S9, Galaxy Note 8 and others. Now it does also still support the regular wireless charging speed for other Qi-enabled devices like the LG G7 ThinQ, and more, which will all charge at 5W instead of 10W. Obviously that's quite a bit slower, but right now, only Samsung is support the faster wireless charging standard for some reason. This wireless charger is pretty popular because of its size, but also because of how clean it is. It's a black charging pad, which looks nice and clean and has a few LED lights around the edge, which indicate when the charger is actually charging and also if it has power. So you can easily look at it and see if the charger is actually charging your smartphone or not, and adjust your phone if need be. This one does also charge via a micro USB cable, which does come in the box with a wall charger.
This item is also eligible for Amazon Prime's free shipping. Which includes free two-day shipping, and pretty cheap (usually $3.99) next-day shipping if you need it extra fast. If you are not an Amazon Prime member yet, you can sign up for a free trial of Amazon Prime. You'll get 30 days free (if you're a student, you get 6 months), and then it's $119/year (or $59/year for students). Prime members do get a whole lot more than just free shipping though, so be sure to check out the full benefits.