Had a few requests so far, can't say, depends on hardware, what I have to order, amount of Kydex required for said gun and platform, no idea just yet. Easiest thing I can come up with is get the customer to do some of the planning work for me, use cereal box cardboard to plan around their gun in a style they like, sort out attachment means (basic belt loop, Tek-Locks, whatever is available from Knifekits.com, or what I can make), and tell me the amount of cardboard they use. So, example, Tek-Lok universal belt system and one square foot of CB 0.093" Kydex to make the holster, plus a dozen 1/4" eyelets and 4-6 Chicago screws......... brings the material costs up to about $20 at least. And I try to keep my labour price at around $10 per hour, but I also tend not to pay much attention to that if I'm having fun doing it, so I may only charge $20 on top of materials even if it took me 4-5 hours to make.
Nutshell, really depends, but am willing to try in order to add to my skill set with working Kydex.