I've found uarus are delicate, when it comes to travel, when they are a small size.... had two 2 inchers die on me for no reason.
also, another lfs has had 1" ones covered in ich...
once they hit the 6" mark they are very hardy...
I've heard them be called the "poor man's discus" but they can be expensive also...
great fish though, my 9" uaru is my favorite fish, eats from my hands and i can even pet him...
I would defidently pick them up if I found 4 inchers for $13.