I'm not sure if my powers of perception are as good as they used to be, but it should mean something like "Would you pay $300USD for my CSMKII accelerator?". :-)
Close, it was an offer for my AmiFast w/16M.
BTW, the Cyberstorm worked perfecly with the AmiFast in my old A3000. Looking at the SIMMFonie I don't think it would work with any accellerator.