I think onion blossoms were a bigger hit a few years ago than today. Do you have a Smash Burger Restaurant anywhere near you?
They are in
Kentucky Highland Heights - Highland Heights Hurstbourne Corners - Louisville Lexington - Lexington Louisville - Louisville UK Campus - Lexington
If you need to take a weekend trip go to one and try their Haystack Onions.
I worked for a bowling alley for a time ran the bar and all food and a guy I forget who told me about onion sticks. I made some and fell in love with them. And we sold the hell out of them.
They are so simple to make and cost pennies. Smash Burger sells what they call Haystack Onions for 1.99 per cup. I'm thinking with the cup out the door cost is around 34 cents. You fry as needed and frying time is seconds you'll need a little salt, pepper, flour and a deep fryer. All though I would use a meat slicer to slice the onions it could be done on the cheap to start.
One other thought if you have the heart go to a Smash Burger and get a job, work for a week or two and you'll know enough to make a great high profit item and great money at events. If you have a current job do it on vacation time. It would be worth it.