Our replacement prop cost over £500 more than an identical one fitted to a permit a/c thanks to the dreaded Form 1
You can import a prop from the USA, with an FAA 8130-3. It is good enough for a G-reg, non-AOC ops.
Anyway, most props will come over with an 8130-4 - an Export CofA. Good enough for anything.
I once paid £11k for a prop with a JAA Form 1, which listed at $9k with an 8130-3.