The level of contribution made in support of open access publication is discretionary, however the following suggested contributions are provided as a guideline.
| up to 500 copies | $1,000 | ||
| 1000 copies | $1,750 | ||
| 2500 copies | $3,750 | ||
| 5000 copies | $5,750 | ||
| 10 000 copies | $9,000 | ||