How to price hay

I am having trouble knowing how to price my hay. I looked on usga website and it doesn't show anything for mixed grass and legume hay. Hay exchange and Craigslist show 4x5 for $45 per bale.

I know my bales are a round 500# and are 4x4.5 at that price it works out to 180 per ton is that right or am I missing something.

I don't want to rip someone off but I also don't want to lose a chance to make better money either.

How to price hay