They are really pretty.
To get a price start by adding up what the bits cost you (don't forget the backing card) and add something for yourself. You may decide you want to earn $1.50 or $2.00 per sale.
I am not a thrify spender. If I like it I buy it. I would be happy to pay $4 or $5 as I value handmade others think you should make a tiny bit. But this also depends on where you are. Also remember if you intend on doing markets and such there is another outlay you need to add to your cost.
Sorry I could not be more help.