Here is a round up of things you can gift directly online, get delivered in the next couple of days, or pick up at your local Target. I tried to compile a list that'd have some options for all of your loved ones (and in various price ranges), so if you're really in a bind, I hope you find some help here!
The Complete Harry Potter Series with Newly Illustrated Covers ($55 on Walmart's website (with delivery before Christmas) or $70 in store at Target): I don't feel like I even need to write an explanation for this purchase, but I will say that the newly illustrated covers are so cool and the set would look gorgeous on any bibliophile's bookshelf.
Guitar wall mounts ($10): Turn any guitar into an instant work of art. These would make great stocking stuffers, especially for someone who's just moved and is trying to decorate a new space.
Paper Source Personalized Notepad Kit ($40): This set allows the gift-receiver to get online and design a custom set of notepads in minutes.
Corksicle Copper Canteen ($33): The largest size of this canteen can fit an entire bottle of wine. Sooooooo I can really just stop typing there, right? It also keeps hot beverages hot for 12 hours, and cold ones cold for 24 hours. I was recently gifted the S'well version of this canteen, and it's incredible. But this one can be delivered with free two-day Amazon Prime shipping. (There are many more colors available if your gift-ee is a guy and/or doesn't want a sparkly metallic water bottle to lug around.)
NARS Steven Klein One Shocking Moment Cheek Palette ($69): This has everything a girl needs: a bronzer, under eye brightener, contour powder and four beautiful blushes. And it's a $165 value(!).
Cards Against Humanity ($25, with $10 expansion packs): If you want to know who the most f*cked up person in your friend group or family is, buy this game. My favorite card is "A Sad Fat Dragon with No Friends." I belly laugh every.time.
iPhone Keychain Charger ($20): I talked about a tassel version here, but this one has a larger hook that you could clip directly onto a handbag or suitcase handle, which I love. This version comes in a few different colors, so it could be gifted without leaning either too feminine or masculine.
Star Wars: The Digital Movie Collection ($90): With everything moving away from physical copies and into the cloud, gifting the Star Wars nerd in your life the entire digital collection would be a pretty awesome and thoughtful gift. Plus, there's no need to worry about shipping or delivery, since you can buy this straight from the comfort of your couch (pants optional).
Black & White Truffle Oils ($35): I love drizzling white truffle oil over fried eggs or tossing piping hot french fries with a little. It never hurts to top with some freshly grated parmesan, too.
Rebecca Minkoff Mini Mac (about $200, but some colors are heavily discounted right now): I have a couple of Rebecca Minkoff bags, the Mini Mac being one of them, and they are just so incredibly beautiful, well made and durable. This black one with rose gold detailing is killing me.