Depends who you purchase it from and in what quantity.
R-12 refrigerant can cost between $30 to $50 per pound, but prices can vary depending on the supplier and location. Since R-12 is a restricted refrigerant due to its ozone-depleting properties, availability may also be limited.
That's actually lower than most markups. I'm guessing you have R410a refrigerant, rather than R22 - you'd almost certainly pay more for R22. You can look online and see the cylinders cost considerably less per pound, but you need to be EPA certified to buy them. With that price you pay per pound, you pay for the technician's technical knowledge and experience, and also liability, as well as your refrigerant. Compared to what I've been seeing HVAC techs charge for refrigerant, you actually seem to have gotten a pretty good deal.
$12 per pound
Per pound of what?
As of 2021, the price per pound of R421A refrigerant can vary depending on the supplier and quantity purchased. On average, it can range from $35 to $50 per pound. It's recommended to check with local suppliers for current pricing.
65$ per pound
As of 2021, the cost of R-401A refrigerant, commonly known as Freon, can range from $8 to $20 per pound depending on the supplier and location. It's recommended to check with local HVAC supply stores or online vendors for current pricing.
tin cost about $50.07 per pound
10 per pound equates to 0.625 per ounce.
£321.33 ($522.24) per pound at today's prices
The price you get per pound of aluminum cans can fluctuate. Currently it is approximately $.30 to $.40 per pound.