My doors are called "Safe 'N Sound" made by Premdoor. They can be found at Lowe's. My double door set (two 30" doors) with a custom 6" wide jamb was only $311. Not bad, considering Home Depot quoted me $1800 for an equivalent.
FYI...the 6" wide jamb was because of: 1/2" drywall outside, 2x4 framing, two layers of 1/2" drywall inside, 1" of acoustic treatment = 6" total.
That's just the way lumber is measured. For example, a 2x4 is actually 1.5 X 3.5. There's a reason behind it, but it escapes me at the moment.
I ripped some 2x3's I had lying around, and then some 2x10's to make my 1" thick strips. So, my strips are 1.5" wide and 1" thick. The only lumber I know of that is readilly available at an actual 1" thick is 5/4 boards used for decking. I had originally planned on getting and ripping those but all of the 2x3's I had were just collecting dust so I changed course. One thing about ripping 1" strips from larger lumber, don't make much more than you will use in a day or so. Mine warped like crazy after a few days. I've got some that I swear would come back if threw them.
FYI...picked out carpet today. I will get measured on Wednesday and install is planned for 19 Oct. I didn't want to spend as much as I did, but it should be beautiful when it's in. We only do this once right? Art not withstanding.