good pricing for linear rails and blocks?

hi all-

i'm seeing quite a few ebay auctions for thk/ino/nsk/thomson linear rails
and
blocks which end up being sold for roughly $150 usually of the 20-25mm
variety with 2 blocks per rail. the blocks are also usually of the
retained bearing type so they don't scatter all over the floor when
removed from the rail.

is $150 or so a fair price? from what i've gathered, blocks seem to be
~$100 new and rails of 20"-30" also price similarly.

thanks!
david



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