Are you really looking for a solar powered light, or just a light with a dusk to dawn feature? If this is what you want I just installed one on the back porch that works great. I still have the box in the basement.
If you want an actual solar powered light with the necessary 12 hour+ battery life needed for winter nights you will not find a good one cheap, they are basically a commercial light that use a large battery the size of a motorcycle battery. Those are not cheap, but the batteries are replaceable and good for a few years.
If you don't need continuous light, you can find good ones for less than $100 that only come on with the motion detector. I bought a couple for use at a remote station that was on a generator. They are 3 or 4 years old and still seem to be working fine. Unfortunately I don't have the boxes for those anymore.