I would recommend staying away from the imported shoulders. I know they can be a good deal. But ya work with good leather in and ya get a good product out. I say that after using
many imported shoulders and double shoulders many years ago and I fought them. I would really recommend either Herman Oak or Wicket and Craig leather. Both are US tanned and you won't have the problems that many imported shoulders do have. Yes they are more expensive, no doubt, but worth it. In a shoulder you will usually have some fall off, maybe some wrinkles etc so it may not all be usable. But you are getting 5 square ft., and at $25 it does sound really good. But the problems I've had was that a lot of times all the tanning solutions are not completely washed out of the leather. Ya dampen the leather for your work and mysterious green spots appear or a white haze. The frustrating part is ya get a couple decent projects and then bam everything goes all to heck.
The cheapest way of buying quality leather is by the side. But you are looking at $220ish and $30 bucks shipping. However you are gonna get a lot of really good usable leather. The most expensive way of buying leather is by the square foot. Both Springfield and Maker's Leather Supply will cut these premium sides for ya and sell it by the square foot. You are paying like $15 a square foot instead of $9 but if ya don't need a whole side its worth it. If you are building just a few sheaths 2 or 3 square feet will get quite a few built for ya. BTW 6/7 or 7/8 oz is bout right for most sheaths. I use 6/7 for some and 8/10 oz for others depending on the size of knife and type of sheath.
I have a very strong personal preference for Wicket and Craig and so does Paul Long who has maybe made more sheaths than me, maybe not, but certainly for sure has been doing it longer than I have since he started leather working in 51 and I was born in 59! Maker's Leather supply will sell Wicket and Craig by the square foot. Look at the russet in 6/7 oz thats what I use the most. For Pancake sheaths or larger knives I use 8/10 oz and they will sell that by the foot too. Really is the way to go. Paul has his own version on the old ya can't make a silk purse out of a sow's ear deal. Something about sh.. in and sh.. out, ya get the idea.
I can tell ya the headaches saved and quality of the product on the other side is worth the few extra $$$.
Wicket and Craig russet 8/10 oz:
Same 6/7 oz: