You might also try some novelty items Dale. It has been a long time since I have seen a pair of Stilts for sale anywhere. I had build a set for my 12 year old 11 years ago and they are still holding up as they do dbl duty by holding my car ramps in place so they wont skid on the garage floor.
Stilts, I used a common 96" 2x4 wall stud and took 1' of it off with the chop saw. This was then cut on the diagonal and set aside. The remaining 7' board was centered in my table saw and ripped the entire lenght.
You target your age groups by attaching the diagonal pieces at roughly the knee height of the child. The top handles dont need much, just a quick plane to remove the square corner and a light sanding. My 11yr old now turned 23 will still use them occasionally. She is good at it, they are hilarious and attract attention (especially from kids) quickly.
I almost made more of these at that time in 98' and thought to use the local hardware store on a consignment type of thing but I became concerned about liability issues

I think that you could realize a lot of profit quickly by doing this by keeping a very low inventory at the start to see how well they would sell. You would price your stilts at $15-$20