1. There is not more common size than any others. To some degree it depends on what you can find to buy as far as used cooperage goes. I use 50L's and sixth barrels. Why? Because when I started my brewery those were available at the right price. The key is to have a "large" and a "small option" From there it does'nt really matter if you use 1/2s and quarters or 1/2s and sixths and so on.
2. Pricing. You probably aren't aware of this but it is illegal to talk pricing. I recommend going down to your local pub, asking to talk to the bar manager and see if he/she would be wiling to share with you a price sheet or info on how much they buy kegs for.
Hope that helps.
Joel
Two Beers Brewing Co.


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