I teach Wilderness First Aid and keep our troop first aid kits up to date.  I have been very impressed with the equipment, prices and service at a company called Rescue Essentials [1] www.rescue-essentials.com.  I have placed several orders with them and they are always prompt and responsive.  The same SAM splint REI sells for $16.00, they sell for under $10.   I really like the fact they sell sterile gauze rolls in a vacuum sealed package which takes only a fraction of the space a traditional gauze roll takes.  I gave them a call and suggested they put together pre-filled kits for high adventure crews headed to Philmont, Sea Base and Northern Tier.  They are looking into it.