I usually avoid Target’s Dollar Spot like the plague, since it is mostly complete garbage that would not last past a single use. During the summer, however, they sometimes get some halfway decent stuff meant for the outdoors. This year they have mostly crap, yet again, but a couple of useful nuggets are there if you look hard enough. Avoid the compass/whistle/match case/flashlight/knife/first aid kit/trekking pole/radio combo, the camping first aid kit, and most of the other stuff they have. The splinter kit and emergency blanket are at least worth $1 each though.
The emergency blanket is pretty self-explanatory, and $1 is a good price for one. Buy several since they are not exactly reusable, and have a ton of different uses. They can be used for their primary purpose, or as a rain shelter, hammock insulation, reflective surface for signaling, etc.
The splinter kit is slightly more deceptive. At first glance, it is crap, thanks to the generic first aid supplies and flimsy bag. I understand the inclusion of the safety pin in there, but it is still a little funny to see one in a splinter kit. The real value in there is the set of tweezers. They come in a nice little plastic capsule that could be reused for pills or other small objects. The tweezers themselves are made from a single piece of steel bent in half. I was able to successfully pick up stuff with them, so I can authoritatively say that they work. The tweezers are not as nice as the ones that you will find at County Comm or similar stores, but they are great for a trail kit.