Diamond D has been around since I want to say the 60’s or so. They run an outfit in the frank. Not sure how adventurous you’re feeling but they’d be one id look at.
There is 3 in Challis area
1. Wild Idaho Outfitters
2. White Clouds now owned by Jarrod Farr
3. Mile High outfitters
There might be a few more but don't know their area or their name of company.