I had my lfs order me 4. I was pleased with them and spent $100 so it was a decent deal too. They were 2.5-3" and at least I could see them before purchasing. I dont think you are going to find them for $15 unless shipping is ridiculous.
Right on, rebus !
While we're on the subject, is there a variation in health/hardiness that relates to the breed or style of discus?
I see the turquoise discus all around, and they are beautiful. But those cobalt blues are amazing, too. Is this a consideration when it comes to health/hardiness, like it is with dogs/puppies where there are overbred strains and puppy mills associated with certain breeds?
Not really, Dave.
It really doesn't matter what strain of discus it is, so long as whatever variety it is that you're getting, is from a known reputable source for producing & raising, or importing quality, healthy fish.
Some discus-keepers may tell you that a certain strain or another may not be quite as hardy as most others, or more susceptible to health problems, but if so, there will be just as many others telling you that just isn't so.
There are different opinions out there, but I've kept many different strains, together or separately, and have never seen any evidence of one strain being weaker, or less hardy, than others.
Oh, and I agree with you - those Cobalts are amazing - one of my favorite strains!
(Although I don't have any at the moment.)