What's a fair price for these things?

Focal Aria 5 kits from way back in the day, good drivers and crossover, really nice sounding, but now replaced by Focal 936/CC900/SR900. Cabinets are in nice shape; black woodgrain not so exciting methinks. What would a fair price be between friends?
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I live in the UK, and you live in the City of the Angels. So these aren't knocking up in my second-hand store or local parcel service for 50 bucks.

But given an ancient (30-y-o) and flawed tweeter section, I could get these sounding like a million bucks for $150.

You should fit Morel CAT 378 tweeters on a second order and adjust the crossover to a 700Hz Fs. IMO. They'd sound brill.