Wholsale pricing to a craft store

[ottor]

There's a small craft store that is currently selling space to individuals that have handmade crafts - she just takes a percentage of the sale.. She's interested in selling more retail, and has expressed interest in purchasing some of my photos at a wholsale cost... I'd want to provide some pictures in different formats - some on gatorboard with a wall standout, some on metal, some large/small - framed/unframed... obviously, my costs will vary quite a bit... Any idea how much I should markup my actual costs for a wholsale deal? - appears she's intrested in about 25 different photos to begin, but .. I have no idea what to charge her over my different processing expenses.. Any ideas ?

tks,

r