The amount of skill points granted depends on the total skill points (including unallocated skill points) the using character possesses, according to the following scale:
Characters with less than 5,000,000 skill points will receive 500,000 unallocated skill points.
Characters with between 5,000,000 and 50,000,000 skill points will receive 400,000 unallocated skill points.
Characters with between 50,000,000 and 80,000,000 skill points will receive 300,000 unallocated skill points.
Characters with more than 80,000,000 skill points will receive 150,000 unallocated skill points.
Large Skill Injectors are created using a Skill Extractor.
Market Prices - The Forge
zKillboard Price: 0.01 ISK