Any interest in Gen 3 Solid roller lifters?

There are lots of great single springs out there. There are some double srpings, but the springs are $500, the rockers are $1000, there is $1000 worth of machine work on the heads, and then you need aftermarket valve covers to the tune of another $1000. $3500 to run a dual spring seems a little steep to me. .600 lift cams make plenty of power in the new hemi though