Magnifying glass was my tool of choice for fire starting. I remember going on an orientation outing with a bunch of school kids, and I was the first to get a fire going. I brought 2 pieces of paper for tinder, and the adults were telling me it's not going to work. When I got it going they surmised that the fact the paper was orange meant it had something in it to make it burn better than normal paper.
So - it doesn't work on non-sunny days/night, but its way cheaper than $40, and you can use it for other stuff (looking at bugs, fungi, etc)