Most custom made Teflon 1500psi WP hoses cost about £40.
That U.S. firm is slightly cheaper (before shipping is taken into account) but I have used Saywell International (Worthing, UK) for hoses and they were about £40, custom made in Saywell's hose shop. Those were top spec Teflon hoses which have no life limit on them (on the TB20, anyway). Anybody can buy from Saywell, direct.
What can be expensive is if you need hoses with unusual fittings - they can be 5x dearer - but I don't think Cessna/Piper use any of those. Socata do have a few...
What is the situation with EASA Part M on engine life? Isn't there a special band 1000-2000kg?