Lordaeron Mounts

Personal Question:

What's the cheapest 310% flying mount you can buy from the store?
Are there any non-consumed 310% flying mounts you can buy for all your characters?
I have a 310% flying mount (onyxia) but I want a mount for all my characters

Also anyone know if any coin shop items are worth buying on Lordaeron?

Merciless Nether Drake (18 Coins) is the cheapest one but its not account bound, I dont think any flying mount is account bound.