"plus $10 for each Raspberry Pi compute module adapter." which I assume means you are also on the hook for finding and paying for however many Compute Modules you want to populate this board with.
From the email I got earlier: "Additionally, we are in the process of sourcing compute modules directly from the Raspberry Pi foundation, which means that we will do our best to deliver Raspberry Pi CM4 to all supporters who need them."
Paying, yes; finding, no?