Prices are shown in the recent DevBlog.
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Currently the "Type 2" is just a basic camo worth 22,500 Credits
She sells in the Inventory for half that
While I don't have finalized information on pricing because I haven't specifically asked that question, this is a basic example to look at for right now.
They can be given out as rewards, sure.
Typically we use the "Doubloon Value" of an item when calculating rewards for a mission. A Mission might have "500 Doubloons worth of value" for some task that requires a few battles, so whatever they end up being internally valuated at would be considered when figuring out what amount of them to give out as a reward.
The Expendable Economic Bonuses can be given out as rewards in the same way that Signals are given out for the rewards. It's functionally the same thing.