I've placed quite a few orders from them over the years, and have been impressed with their quick service. I usually phone my order in to make sure they have what I want in stock.
Look under Supplies/Hangers/then Hanger Groove. I think it's worth the $1.90 to have the groove routered in, rather than using the metal type hanger. It then lays flat on the wall.
I also order the small deer mannikens, too. Not the cheapest way to go, but it makes mounting them real easy.
They also do custom laser engraving. I've not had that done, but a buddy has them put the year on them, and he's been happy, too.
This sound like an advert for them, but It's not. I discovered them at a hunting show in Michigan 10 or so years ago.