I buy multiple or single cans
These are Flat top Opening Instruction cans
This is a cone top Can. 
I am a collector of cans not a full time can dealer so I can usually offer more for cans or know somebody who will.
I am in the Air Force stationed at Offutt AFB in Nebraska, so I do almost all of my transactions through the mail.
What I do is speak to you about the cans, look over the pictures you send and make an offer. If we agree on the price I will send you a deposit and you can send me the can(s) for inspection. Then we decide on a final value and close the deal from there.
I have found this works well. As I am in the AF I can be easily found and you have a deposit, I get to see the cans in person before the deal is done.
I buy Flat tops and cone tops from the 30's to 60's
E-MAIL ME 801-710-5335
Charlie@beercanexchange.com
This is a Pull Tab can.
Note the can was made BEFORE pull tabs