Not sure exactly what you are looking for, as far as sizes but here are a couple tips. I went through this about a year ago and bought from two places, McMaster-Carr and Ebay.
Mcmaster has C110 sheets from $11.50 to $15.00 a sq ft, depending on size. Shipping was kind of expensive but I got the size and thickness I needed. First delivery came in damaged (BIG forklift dent in it) and they replaced it no problems and replaced it fast! Excellent customer service.
Ebay I bought some thicker stock (.097” x 24” x 24”) for the pot bottom from Shapiro Supply. As I remember the sheet was about $88.00 and it was in my hands for less than $100.00. Excellent packaging and I would happily deal with them again. I am actually thinking of making a 5 or 6 gallon version of what I have now so shopping around for materials again. Attached is a link to their Ebay store, check out the .032” sheets. .032” x 24” x 36” for $72.00, $86.20 including shipping. They have other sizes also, just find what you need. If the link does not work… Go to Ebay, search for “Copper sheet” then choose Online Stores way at the bottom. Shapiro’s name is right under the description, click it and search for what you need. They also have lighter gauge pieces for your cap and all.
Never bought from Online Metals so can not give a first hand rating.
I almost went the piece together route for my new pot, using 4 pieces for the pot itself and riveting/soldering together. I still have the rivets and tools so might go that route for this one just for the look! Good luck and let us know how you make out.
- Woodyhttp://stores.shop.ebay.com/Shapiro-Sup ... mit=Search