My email said the Mystery code is valid May 18 and May 19.

For the brave, Cashback Flash–Pay $150, get $150 back in points in 10 installments. Includes 53 different items, ranging from tools to jewelry.
Members get $150 CASHBACK in points total in 10 weekly installments when you spend $150+ at Sears. 1st set issued next day, then every Sat starting 5/11, valid 7 days. Limit 1. Cannot Combine.Valid through May 04, 2019 11:59 PM CDT
Cashback Flash

I’m getting the below message when I click on a clothing item selling for at least $20.
Members get $20 CASHBACK in points when you spend $20+ on an Apparel purchase at Sears.com and select Sears stores. Points issued next day and valid for 7 days. Max $20 in points. Cannot Combine
It does not mention valid dates, though.

I recycled an old generic MP3 player today and got the coupon. It expires 5/25/19 and is valid in-store only. Lots of exclusions–not good on desktops, laptops, tablets, streaming devices, Amazon products, Apple, Bose, Google products, Epson Ecotank printers, ink & toner, gift cards, phone cards, stamps, etc. Can’t be used with any other coupon or on an item in which another instant savings offer applies.

You may be able to check local store stock with this link.
Charger
Just an FYI, though, there are reviews of other PowerXcel products on CVS.com and they’re not very good. The cables have very poor reviews.
Sorry, looks like I posted the link for the car charger, not the wall charger. I can’t find the wall charger online.

Also, 30% off for Kohl’s cardholders, March 1-6, with code MARCH30.

@briarycliffs I usually keep some clothes in my cart just to check daily prices/points back deals, etc. I noticed I was getting $10 back as I had $20 in clothes in my cart.
If you click on a clothing item and select specific color & size, then click on the arrow just below the price, where it says earn xx back in points, it’ll give you a bigger drop down list that shows the $10 back on $20.

Kmart.com. $10 points back on $20 clothing purchase until 2/23/19.
Members get $10 CASHBACK in points when you spend $20+ on Apparel purchases at Kmart.com. Points awarded next day, valid for 7 days. Max $10 in points per member. Cannot combine with other offers.Valid through February 23, 2019 11:59 PM CST.

Also, I never got any emails from Sears or Kmart, but I happened to check my SYW account and have about 6 Freecash offers, $10 on $30 clothing at Kmart, $10 on $30 shoes at Kmart, $10 on $20 jewelry at Sears, etc.