my experience with large cylinder on R12 when last available at stores is bad idea for long term supply as one tiny valve leak and you whole supply is gone

good idea to stock up now while you can still buy R134a

maybe here but question if additives and may require certification although many just ask you to say you have one

R-134A Refrigerant 15 lb. cylinder

Premium 15 LB R-134a Gas Cylinder – Ideal for Vehicle and Home AC Systems Main Features: Top-Grade Purity: Each R-134a gas cylinder is filled with 100% pure, factory-sealed refrigerant, meeting the high standards of ARI-700 for quality. Diverse Uses: Suitable for a range of applications...

www.arcticrefrigerants.com

 

that looks like the best deal so far. I see 5 gallon tanks selling for the same amount.
although if it won’t store long term I would rather pay less for a smaller quantity.

 

digger84 is right about bigger cans leaking long term, all your money in one container is cheaper until the valve has an issue then you loose it. Individual cans at Rural king are about $9 when I was there last week.

 

R134, R-134a, Refrigerant, LARGE CAN, 28 oz. Includes Dispenser & Brass Cap NEW

R134, R-134a, Refrigerant, LARGE CAN, 28 oz. Includes Dispenser & Brass Cap NEW R134a RECHARGE YOUR R134a system! Coolers, Freezers or Automotive A/C. *NEW STYLE, LARGE 28 oz. can of R134a Refrigerant. Price is for item as pictured. The connection on top of the can is 1/4" male flare with valve...

frosty-freezeacproducts.com

This should much cheaper somewhere else but i cant find a resource.

Not sure why the price is so high when you can buy 3 12oz cans for $30.

 

Why are you not wanting to just buy a half dozen cans to use as needed?

 

I just want to weigh a single can when I add it.

Charging A/C with small cans - interesting article - Pelican Parts Forums

I recently ran across this article about charging with small cans and how to adjust for refrigerant remaining in the charging hoses and for each can

forums.pelicanparts.com

 

still looking.