i assume we're all talking about a 'frag' here (which i usually see as a 1" to 3" offcut) if so i agree, i think $20 - $25 is a good price and fair for both seller and buyer. as we all know this is not a cheap hobby so having something to cover costs helps. however im not in it to ripoff my fellow reefer. also, what goes around comes around, im sure the buyer will provide the same favour back in the future if they have a frag you want. i agree with ira too, $40 is too much. at $40, you would expect a decent size 'frag', eg: an sps at least 4" with several branches. its not hard to know when you're getting ripped off speaking of which I have plenty of xenia frags if anyone is interested. decent size for $25 will put an ad up in private t&e soon with a pic.