Although I haven't been there in 6 months or so, American Flatbread in Burlington has some tasty brews to sample as well. I highly recommend a stop in there. Great flatbreads as well.
Yeah, I'm not sure I buy the theory that you can carbonate any faster based on the size of the keg. 12 PSI is 12 PSI. If you use the 'set it and forget it' method, it doesn't matter what volumn the vessel is, I think it's going to take the same amount of time to absorb.
I won't even debate...
They should be cheaper then that at the LHBS. I just don't like to pay what they want for them either.
Adventuresinhomebrewing.org has been good to me in the past too.
Good luck! They are few and far between in the Chicagoland area. And if you do find some, the seller must have had them gold plated based on the prices!
Someone correct me if I am wrong, but wouldn't he want to double ALL the ingredients if making a 10 gallon batch. If you simply add an extra 5 gallons of water to the ingredients for a 5 gallon batch wont you just end up with 10 gallons of extremely watered down beer?