Poke around www.betterviewdesired.com
Then you can check out street prices at Adorama.com or do a search for camera world.
Eagle Optics touts itself as having great customer service, but when I asked them what they could do to help me after my G/F threw her diopters out of kilter, they didn't do squat. I understand that they are under no obligation to, but if they don't go the extra mile, then why pay a higher price for mail order.
I realize that there are a lot of people who apparently spend $1000 on a set of glass, but I also know of a couple of fanatic elk hunters (who admittedly hunt coastal Roosevelt elk where the distances are smaller than say eastern Oregon) who scoff at the idea of blowing more that $300 on binocs.
Your buddy is going to spend a crudload if he wants good binoculars in the 15X60 range. Minimum $400-500. I believe that Fujinon makes some roof prism phase coated models in this range.
I am very happy with my little Pentax 8X30 WP roof prisms which cost exactly (you guessed it) $300.
Suggest to your buddy to go to a camera store, preferably with a big parking lot, and see if he can really use that extra power without shaking like he has the DTs.
I think you're right that he will be OK with the 8X50s, although come to think of it, I didn't know that steiner made 8x in other than small and 30mm or 56 mm objectives.