Unfortunately, these things sell for much less in used condition on ebay, in the $50 to maybe $75 range. https://www.ebay.com/b/Tripp-Lite-240V-Computer-Power-Distribution-Units/86723/bn_2780964?rt=nc&_sop=15

Even though I believe your units are probably much newer than the average one on ebay, used is still used. I would maybe consider all three for $150/shipped, but I have a feeling that will be too low of an offer for you.