Pebble, my whole family have swags (kids - 7,5,3). My eldest went from a cot to a swag and only recently agreed to a bed. The great thing I found with the kids having swags, was that they would go anywere and they would sleep. If they were at their grandparents, friends, or camping they would go to sleep as they were used to the swag and they would keep all their crap in them and roll them up. We went to Cent Aust last year and they had no problems just sleeping in their swag under the stars.
I see people are paying a lot of money for them. I get mine shipped from Alice Springs and for a single including shipping they are about $200. They are just a standard swag, ie no poles or covers etc. The do them in singles, motorbikes, doubles and queens and in different colors. My daughter got a purple delux single swag (has a heavier matress) and I reckon that was only about $220 shipped to melbourne.
I think the company is Alice Springs Canvas Co. I bought my first one from them over 20 years ago and still got it.