Alternative to R508

[chilly1]

Hello,

We have an environmental chamber with a cascade system that uses R404 and R508 refrigerants and we need to repair it. We are finding the cost of R508 is US$350 - US$1100 per pound depending on where you get it. And the minimum purchase quantity is 5 pounds, we only need 1 pound.

The system is designed to go down to -70 deg C.
We may consider changing the low temperature setting to -50 deg C if there is a lower cost alternative.
Does anyone know if there are any alternative refrigerants that may be less expensive and more readily available than R508?

Art

I have R503, R23, R1150, Iceon89, R116, R14, and about 15 others Now I can mix up some R508 for you but I can only get the blend within a few percent of correct. Costs per pound is astronomical the 116 was 650.00 for 15 lbs, the R23 was 285.00 for 15 lbs.

your not in Vegas are you????