It works, is washable and inexpensive. These prices are just guidelines from a popular outdoor catalog. If you stick to the specifications above, you should be able to find a sevicable bag at a reasonsable price. Now a few hints on packing. When in use, stuff the bag into the smallest stuff sack it will fit.
Some compression sacks use webbing to get size even lower.
Stuff sacks should be lined with a plastic bag before inserting the sleeping bag. External plastic bags work but tend to get snagged. Never use your sleeping bag stuffsack as a bear bag . The food smell gets transferred from the stuffsack to the sleeping bag. I would like to add other web resources related to this subject.