New Refrigerant: RF1234yf HELP!

[drew86]

The ac in my '14 Challenger is not blowing very cold anymore, if at all. Summertime in Florida is not so fun. Dropped it off at the dealership and agreed to pay the 130.00 to run the diag and find the problem only to get a call back saying it would be $497.00 because the new refrigerant is incredibly expensive. They have to evac all the old freon and replace it with new. This is just to diagnose the problem, not to fix it. Is there ANYWHERE else that someone may know of that I can go or how to find a place that handles this new freon? Figured I would ask here first to see if someone else had another resolve. Thank you in advance!