I carry in an old faithful IWB holster. Was definitely easy to put together, and I like the fact that the tension is adjustable. After a week or so of carrying daily, the leather had loosened up some, and if it had rivets instead of the screws, I would have been stuck with a holster that was too loose. Instead, just tightened up the screws and it's been great.
I think there is an IWB holster that looks identical to the Old Faithful, but is preassembled and a little cheaper: https://aliengearholsters.com/
Haven't tried one of theirs, but looks identical to my Old Faithful. Will be picking one up for my son to use.