If you look at digikey for 4 oz double sided boards they will all show no-stock with big lead times. They special order them only. If we want to save big money, we can order a custom 24x24 or 24x36 "6 oz" double sided copper, and have it cut up (or not if it's easier to mill whole) and probably still wind up around $16.00 a board. It's been some time since my research, but that's close. I can dig back through my notes at some point and pull quotes that I received when we get closer.
Wherewolf
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