Need Some Advice for My Steampunk Store

Hi friends, I build a steampunk theme online store which sells some DIY materials, such like gears, old watch movement etc, the problem is I didn't find similar online shop so I don't know if my products are too expensive, I want to sell them at a competitive price, so can you have a look at them and tell me do think if they are expensive?(compared with other shop both online/offline), Great thanks to you. link Below