All good advice from Mike999....
If I want $10 for a kit I mark it $15 .... $20 I mark it $25....some people just pay that price and don't ask for a discount.... above that If I paid $30...$45 or more....I ask at least that. and can decicde there if you want to sell it for less... I drop prices on my higher dollar items when I'm not doing as well as I wish.
Good Luck !!