So other than getting lucky on Diver’s Den, is there a place the average hobbyist could order wild colonies from that are actually nice, high quality? That haven’t been picked over by those with deeper pockets?
You kinda have to know what to pick, as well. Some corals are just always going to be what they are.. red or purple or green. If you see some Tenius, then you could take a chance on that since there are all kinds of different colors. Tables, microlodus, torts, etc. can be nice, or you could have just bought a plain old blue tort. Wild Milles, Spath and Prostata are often fantastic if you can keep them under whiter light (they are very shallow usually), but they also have a VERY high death rate.
A very large amount of wild stuff does not end up being what it is in captivity for quite some time - sometimes more than a year. Some of the good stuff from Uchin (pinky the bear, etc) was in captivity for year or more before it settled into what it turned out to be.
When I take a chance, I do it on Deepwaters... Lokani (if I can find one), Loripes, Rosaria, Granulosa, Echinata, dragons, etc. They really can take a while. I bought a fully green with purple polyped Rosaria about nine months ago and it might be a red tipped teal-blue rosaria in captivity. If so, it is going to be fantastic, but time has not told the entire tale yet. However, I lost two Loripes in the same order and only have two barely-hanging on frags of a Echinata and Granny left that could die any day. The market is limited on reselling deepwaters, so not many people do this... but I like them and the old school crowd that I trade with likes them.
I do have a wild Plana that is going to be legitimate fantastic - it died back to a 1" stick. Pearlberry blue base with purple tips and corallites and blue polyps. It is really good. It has been about 24 months and I am just now ready to frag it away... the locals have been wanting it for a while now.
Be prepared for great losses with wild stuff, some stuff that turns out just-blah (this stuff always survives) and then some stuff that ends up being excellent.