I originally thought the op was talking $500 per axle.
After reading the second post I realized he was wanting to replace all 4.
If I could find a shop to change all 4 monroe sensatrac struts with an alignment for $600,I'd jump on it.
Might be cheaper with some cheap generic struts,but I wouldn't waste the money,IMHO.
I have a feeling after all is said and done,it could possibly be a few hundred dollars more.
We shall see.