The 1#'ers are sure convienent, but I just can't bring myself to keep throwing these bottles in a land fill after merely one use.
I use the following stove (I actually have 2) , a Sievert 925.
It is refillable and holds a gallon of LP.
Open/ready for use http://www.tnttt.com/gallery/image.php?image_id=2552
Closed for transporthttp://www.tnttt.com/gallery/image.php?image_id=2553
If a 20#'er seems too large for you, there are 4.25# (10.9 x 9.13 inches) or 5# bottles, as well as 11#'ers (16.6 x 9.13 inches).
They're all more expensive than a 20#, but if you're saving space these are the ticket.
If I use my Coleman grille/stove I use a 5# bottle. I get my 5lb bottle filled for $3.00..... seems I would go through 8 or 9 throwaways for the same cooking duration before having to refill the 5 lb'er. (I realize that the math doesn't work, so there must be another factor working here)
Even if it was a "break-even" vs. the 1# bottles I'd do it merely to have less trash.
5# bottle $3.00 refill vs. 5- 1#'ers @ +/- $2.25 or $11.00 - you can pay for a $40.00 bottle pretty quickly, not to mention you're creating less trash.
REI has the smaller bottles as does Camping World, etc,
but Bass Pro Shop seemed to have the best prices when I looked (4.25# @ $40. & 11# @ $45).
If not in your local store, they will special order at n/c.
http://www.basspro.com/servlet/catalog.TextId?hvarTextId=18054&hvarTarget=search&cmCat=SearchResults