Few quick questions to narrow the hunt parameters:
- How much money per bag is acceptable?
- Will they be used for car camping or backpacking/canoe camping?
- What is the lowest temperature they have to handle?
If cost is the limiting factor, there are pretty cheap dacron-filled sleeping bags at Walmart/K-Mart/Target type stores. You could get three or four of them for about $100. I've also used $20 el-cheapo sleeping bags for "sleeping in the car" bags with decent luck. Whether such cheap bags will work for you depends on your comfort level.
The Sportsman's Guide is another place that seems to have very cheap prices. I've never personally dealt with them, but some of their stuff is semi-brand-name stuff. Some other looks like imported inventory reduction P.O.S. IMHO shop carefully there.
http://www.sportsmansguide.com/
My personal bag is a Wiggy's Super Light (rated to 0 degree F, 4 lbs total weight) with his Lamilite insulation. Bombproof bag for about $165. If you get two of his bags, I think most will zip together. Excellent customer service.
http://www.wiggys.com
Remember, if you've got two bodies inside the bag(s) there's a cumulative sharing of heat. That means your bag doesn't have to be as insulative to remain comfortable as when you're sleeping alone in the bag at the same air temperature.
