My DD does Violin, we were told DONT buy from Ebay ... we were sent a list of places that the school was happy for us to purchase one.
My daughter has been accepted into the violin program at school and we were told this also.
We were told to stay away from the cheap eBay one's (not 2nd hand quality brands - I'm talking about the $50 coloured ones) as they are made out of cheaper materiel's and do not stay in tune. I was also told that if they are dropped etc that they are most likely to crack instead of just dent or chip.
Our daughters teacher was happy for us to purchase from anywhere as long as she could see a photo or print out of the violin first.
In the end we purchased a brand new violin, fully strung and suited to my daughter for $150. It also comes with a cloth to wipe it down, bow, rosin and extra strings. It is an Enrico brand and is a 1/2 size. She has just turned 8years old but is on the smaller side.