Ben, this place is right by me. They had a good deal on al plates, so I bought one and halved it. They typically only have one or two at these prices as they are cut-off pieces. If you're looking for plates, they could be an option. If they don't ship on the sale items, I could help get it to you. http://www.themetalstore.com/products/Aluminum/6061-T6-Flats/6061-Aluminum-Flat-Bar.htm
Head up to Cherry City in Salem. They had a few big pieces of aluminum. I bought a sheet of 3/16" copper there for $4.00 a pound. Not bad considering I just sold 100# of copper scrap for $3.20 a pound.
Yeah its a 47 liter, I just set up an account with Airgas. So it will only be about $95 to fill it. I believe the working time is over 3 months on this dewar.
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