Your best bet is to use one of those 'find-a-part' sites where you invite breakers to quote for the part you need. e.g
https://www.breakerlink.com/
http://www.partshark.co.uk/
http://www.breakeryard.com/
I paid £30 to replace a broken rear deflector recently but I agree, salvage breakers and ebay seem to be driving prices up not down. There are some parts where I've tried making an offer to some ebay sellers but each time they've rejected what I think is a sensible price.
good luck with your search