I believe you can buy each piece separately. As far as price goes its pretty costly, but her legs are in better shape since she switched. Her knees don't hurt as much as before.
Yes it looks like it can be switched to the other side. As far as fit she loves the way it fits, and said its more comfortable. She likes the helmet better than the All Star and under armor she had before. She says the jen schro are the best Shin guards she has ever used.
My DD had the all star vela guards and switched to the Jen Shro shins. She loves them and said her knees are never sore from blocking now. She will put the vela shins on sometimes when she is on concrete and doesnt want to scuff up her eastons. She hates the velas now