Buy on Mac App Store
Recall Toolbox is a one-time payment of 29.99.
This is generally 29.99 in your local currency (i.e. AUD29.99, USD29.99, CAD29.99).
However, if your country doesn't have an equivalent of 29.99 (i.e. Rp499,000 in Indonesia), it will default to a USD$29.99 equivalent.
You can find information about Educational Pricing here.