What ever you think is fair. There are no pricing guides. If you go on reefcentral right now there's a guy selling a huge birdsnest colony for $30 but his original asking price was $100.
I bought a plug full with garf for $15 a while back. So maybe that could go for about $130ish in stores but I would say $75 to $80 maybe.
In all honesty tho.. fiction is correct. Which ever you see as fair. So +1 on that
Sorry but this thread is considered price fishing even though your intent may not be so. Also you have not met the 30 post minimum to sell requirements so this could also be seen as an attempt to sell inconspicuously.
I am not accusing you of any of the above, but we have these rules to protect the membership here and there is no real way to determine who is legit and not.