Unfortunately, we all have to pay the same price when ordering a 3/8-10 tap. I have three, a normal 3/8-10, a normal 3/8-10 that I ground to be a bottoming tap, and then a piloted .308 tap.To my knowledge, and with alot of searching, no one else makes/sells them for less. You may be able to borrow one from someone for this one time project, but if you damage it, expect to reimburst the full amount. Or send someone the item you need tapped and save yourself the trouble and/or price.
Just a few thoughts,
Dave