The capacities are approximate.
1 pint............$11 or two for $20
1/3 gallon..... $15 or two for $26
1/2 gallon......$18 or two for $30
1 gallon.........$23 or two for $38
1 1/2 gallon...$28 or two for $48
I'm planning on letting my new hugel bed 'mature' for the first year and see what it does without any ollas. I put about 100 lbs of cow manure into it so maybe it won't be too deficient on N until I get some organic materials built up. I made a raised bed last year out of an old stock tank and it was hugel'ish' in that I had about 12-15" of
wood chip mulch in the bottom. I planted pinto beans around all the peppers and cucumbers to fix N. This stock tank was six feet in diameter and I had 9 of the 1/2 gallon ollas in it. It did OK considering it was a brand new, immature bed, in full exposure to the sun and wind ( including the metal sides) in the second year of this drought. As it matures, I expect better results but I have no benchmark from which to assess its sucess, considering the drought, new bed, etc. There are several others in my area who put them into new, raised beds and they have similar feelings about the ollas performance in new beds. You might contact Ogallala Commons and see if they've posted anything on their website or the Local Llano blog. I can get those addresses if you like.
As far as shipping, they do just fine. Our local Pack Mail, owned by our University Economics Professor, does a great job in getting things shipped! I even haul them around, layered in blankets, in the back of my truck when I make local deliveries. I've not broken one yet! I'm sure I will at some time but thus far they're quite resilient. In this drought, I put the seeds close to the neck so the roots grow straight down to the flared belly of the olla. I tried onions placed a foot away, last March, and they failed. For transplants I recommend planting a little wider, but still close, even with an olla on either side of a large plant such as a tomato.