0-10 units - FREE
11-15 units - $8.56
16-20 units - $10.56
21-25 units - $13.56
26-30 units - $16.00
31-35 units - $17.00
36-40 units - $18.00
41-45 units - $19.00
46-50 units - $20.00
51-55 units - $21.00
56-60 units - $23.00
61-65 units - $24.00
66-70 units - $25.00
71-75 units - $28.00
76-80 units - $30.00
81-85 units - $35.00
86-90 units- $40.00
90-100 units - $49.00