ISP: CenturyLink
Type of Connection: DSL
Connection Speed: 10mb/s
Time:5/20-5/30
Frequency: Always
World name: Ultros
Character name: Haley Hodson
Race: Miqo'te F
NPC name: Market Board
Monster name: None
Class/Level:Monk Level 50
Party or solo: Solo
In-game time: 12:00 PM
Area and coordinates: Steps of Thal 14x,10y (happens at all Market Boards though)
Steps:
1. Right-Click Market Board
2. Select Materia under Items
3. Scroll to Heaven's Eye Materia IV and select it
4. Select Heaven's Eye Materia IV being sold by retainer lpod(with and lowercase L or an uppercase I) for 160,000 gil
5. Left click yes to confirm purchase.
6. Recieve alert stating "Unable to process transaction" or something akin to that.

This has been confirmed by multiple other players as well. The Heaven's Eye Materia IV is not purchasable by any player.