I would suggest shopping around a little more.
I have purchased frags in the $10 to $20 range; however, I found a nice candycane coral (one of my first purchases) with about 20+ heads on it for $39.99 at a lfs
that was having a sale (normally $60).
I have since fragged this coral twice (once on purpose to give a piece to a friend, the second on accident while rearranging the tank about 5 months ago - got two nice small frags about 5 heads each along with the mother colony which has 40+ heads on it). And now you can't even tell that the mother colony lost 10 heads just 5 months ago.
I have found that the really small frags just do not have the vitality that some of the larger pieces do. I have had a couple of very small frags never make it. This isn't the case for all specimens; however, it has taken my frogspawn frag about 18 months (1 tiny head ~$15) to have developed two more heads and grow to about a 4" diameter clump.
And sometimes the hobby can surprise you. A piece of rubble that I purchased for my refugium made it to the main tank and lo and behold after a few months 5 small frogspawn heads developed (completely different color than the one frogspawn I have)
I guess I am trying to counsel you to try and get more complete corals as you may have more success with them and feel less like you are getting ripped off. In my experiences, I have rarely regretted getting a slightly more expensive specimen that came out "cheaper by the head".
You can also try Petco. See my advice from earlier today.