I can only give an example of how I price MY stuff.
I pay myself $5/hour for hairbows. Then I add in supply cost & whatever fees I have to pay.
So for example: $5 for my time + $3.50 for supplies + $.50 for fees=$9.00 for hairbow.
I figure out the cost of my ribbon per inch when I buy it, price per clip & price per embellishment to calculate my supply cost. It might be extreme, but it works for me.
I would say figure out how much you think your time making it was worth & then add the supply cost to that! Don't sell yourself short.