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Kramer Confidant might be a solution. They are made by Kramer Handgun Leather who makes a wide selection of quality holsters. I strongly recommend the full length version so you can tuck it in. You can find them here:

http://www.kramerleather.com/products.cfm?categoryID=21

This is a product made in the form of a mesh undershirt with a pocket under each arm pit which will hold a small pistol or revolver and extra magazine/ammo. The pockets close with velcro. They are well made.

It is undectable unless someone is going to frisk you.

It is not uncomfortable, but properly fitted needs to be a bit snug. I wear an underarmor wicking type T-shirt under mine

Due to body moisture, I would recommend a stainless steel model or other rust resistant model of weapon.

Due to the nature of your business which can entail squatting, bending, laying on the floor, I can't think of anything else that would would be both reasonably comfortable and undetectable. At only $50 a pop, it would be worth a try.

I hope this helps.