Take a look at Microshift. I bought one for my singlespeed so that I could have gears when I travel. Microshift is compatible with Shimano cassettes. On Amazon you can get a brand new shifter and derailleur for $92: https://www.amazon.com/microSHIFT-Advent-Rear-Derailleur-Compatible/dp/B0CX47S75Y https://www.amazon.com/Microshift-Advent-Trail-Trigger-Shifter/dp/B08778S7T9 It's a tad clunkier than Shimano which tends to be pretty smooth, but overall I have been happy with them.

I'm looking for a Shimano 10spd shifter and derailleur, already have a cassette, preferably gently used or in take off condition. 

Well... maybe I misinterpreted. No Electric Remote Dropper. 50% of my cable actuated dropper use is for stopping on flat ground with my short legs. 

I'm there with you both.

@RedRider3141  So no dropper for you ?    I thought I was the only one