I'm sure he doesn't source them in huge quantity's IE "1000's of unit's" if i had to venture a guess if he's selling it for 90 he's likely playing around 35-40 on the low end and 50-55 on the high end "since it does have custom feature's", he likely sources them in the 50-100 a piece range so it's a pretty big investment especially if they aren't moving alot $4,000 is alot of inventory to be sitting on if your not selling more than 1 a week, either way if you e-mailed he'll get back with you, just remember he's in the UK and there's about a 12hr time difference.