Hi Nickelflippr,
Yes, Aluminum boards are expensive than FR4, if 0.7W max of heat,then FR4 should be ok, but it seems the diameter of each pcb is small, the boards should be done by panel.
Like I said, the pricing changes for the board size and the quantity your order and something else, like soldermask and silkscreen, surface finish, lead time...
where is the post here previously about a 200 in² $89 + $30 shipping, can you give me a link?
Regards,
Hong Bin