I think most of those I posted can be bought in 0.060 over, plus the Probe pistons, KB ICON, and Ross. What heads and compression ratio are you looking at using?

Custom pistons can be bought, but check around on the cost because some can get over $1,000/set.

The list I used above was when researching low cost pistons for a mild street engine.
I think the 440 source pistons are KB ICON brand, but for aftermarket rods with a 0.990" pin.