Latest reply I've received.

"Hi Joey,

Yes, we offer a volume-based discount for customers who buy at least 8 pairs. The reduced price for the type of springs you have inquired about would be $390 and would apply to orders that accumulate within a half-year period. The shipping price per pair would go down based on how many could go into each parcel. These springs may go 3 pairs to a parcel, but I’m not sure if that many will work without doing some checking. There might be a substantial savings if ship-based cargo were used for a shipment of quite a few pairs, but that would have to be checked out. Base the weight on about 19 pounds per pair with a parcel size of about the same dimensions as the cubed length & height of the springs.
We can make any spring rate, and variations in dimensions are not a problem.

Mark"