price check - helmet, chest, leggings and boots enchantment list protection 4, unbreaking 3 and mending
Sounds very valuable. May I ask for a screen shot? edit: prot 4, unbr 3, mending can go for 3k/piece. But there are many playing selling discounted gear these days so you might find cheaper.
Enchants can be added to existing armor. So armor with thorns might be ~300r to 500r more than armor without thorns.