If folks want to buy CPK gift cards, if purchased by 11/21, for every $100 you spend (you choose denominations), you get $10 bonus card to be spent by 1/6 and $20 bonus card to be spent between 1/7-2/24.
They can make nice stocking stuffers in small denominations, or grab bag gifts.
Was traveling yesterday and was near an Ikea so flew in and grabbed several frothers for stocking stuffers - great deal and they work great for $2.99!
CPK?
California Pizza Kitchen?
Yes, CPK = CA Pizza Kitchen
I always include a nice lip balm (both kids get chapped lips). And more recently (both kids are over 21) I’ve put a bottle of wine in each stocking (takes up a lot of room LOL).
I don’t think anyone has mentioned these reusable twist ties. They are perfect for headphones but have lots of other uses https://www.amazon.com/Nite-Ize-GT3-4PK-A1-Original-Reusable/dp/B004MMEHKG
I can’t remember if anyone has mentioned umbrellas. I picked up several for half off on Black Friday.
I may try to find some car safety items for stockings also.
Flirty Aprons has some aprons on sale for $10.
Totally practical stocking stuffer, but I’m hoping S19 and D22 will enjoy them. They are surge protectors with USB ports (kind of a cool shape). Figure outlet space is always a premium for all the gadgets (especially in college).
We sent our son a Hanukkah box (it starts Sunday, early this year) with little gifts (that at home, we would’ve put in 8 small boxes). They included a funny book, beef jerky, a chocolate orange, fancy-but-masculine lip balm (Jack Black brand), and a couple of small practical things that are good for his sport. It doubled as a Finals care package so we baked something he likes and put that in the package too.
I found a ton of really cute stocking stuffers at World Market this week. Including vintage candy which I know will b a big hit for DD.
I wanted to post these the other day when I bought them on an Amazon lightening deal but there was only 10 minutes left in the deal so I didn’t - BUT these get really good reviews and could be used for males or females - my D’s like to use them when they don’t want to carry their whole purse but can slip this is a pocket or small bag. S will use them too - I got them yesterday for under $10 so I was pleased!
RFID blocking too - and a million colors (check the color for prices - they are all different)
https://www.amazon.com/gp/product/B077CSKYV3/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
Remote for phone on camera and maybe a small tripod. Getting this for my DIL who has lots of photos of baby but not many with her in them. Here is one remote, but you can find them for around $8. https://www.amazon.com/dp/B01K3G32WI/ref=twister_B01K3G30BQ?_encoding=UTF8&psc=1
I agree - World Market is the best for stocking stuffers. Also Container Store.
Pop sockets are another phone accessory that some might like. It does make the phone thicker, so not good if you usually carry your phone in a pants pocket. It’s also useful to prop up the phone when using the flashlight. You can’t pull it on and off without ruining the adhesive, though; so once you put it on, you basically have to leave it there.
The clips that attach your cell phone to the car dashboard are another good idea for kids driving older (pre built-in GPS screen) cars. No more looking down at the cup holder or your lap to follow the map.
DIL really appreciated getting a cellphone tripod and remote as a gift from her sister last year. It has made it much easier to take photos of GD and the whole family.
Genevieve, my son also loves those chocolate oranges
A practical gizmo for folks who have curling irons, irons, etc. without auto shut off. Also good for tree lights. 
Rue Lala has Pandora charms and bracelet at about 60% off, plus I got free shipping. We have birthday/graduation/christmas/birthday, so not sure they are stocking stuffers or gifts for the other occasions.
Also in the gift swap thread, but these eyeglass cleaners are great.