Kyno already mentioned it, but it's about $200 if you're lucky and $300+ if you're unlucky. I've only max rolled 1 character (Visas) and it was the equivalent of $275 in crystals.
I typically only buy the $10 pack with new character release (because I know the Devs gotta eat) and will occasionally buy a vault that I put towards G11 gear. Those yellow eyeballs and yellow medpacs drop so rarely from HAAT that I usually put a lot of crystals towards those and the occasional 20 MkV Stun Gun pack to augment my farm.
