A jar of 2% 4oz containing 2.27g Ahk-Cu. $120 / 2.27g equals $52.86/g
A jar of 5% 4 oz containing 5.669g AhkCu. $210 / 5.669g equals $37/g
5 Grams of pure Ahk-Cu costs $200. $200 / 5 equals $40/g
Conclusion: I would probably benefit the most by buying a jar of 5% solution and adding 1ml/day(0.0472g), lasting me 4 months.
Althought one might benefit more by arranging a grouporder where the price could get vere benefitable. EG: 20 grams of AhkCu costs $30/gram. Perhaps we could get an even better price for 100g.
I am a bit curious about their vehicle though..