We haven't been able to find it. It seems that they have removed some functionality without having a way of buying the sku..
On page 5 you can see;
Dynamics 365 Unified Operations Add-ons
Talent comprehensive hiring: to get the entitlements included with the Talent comprehensive hiring addon,
customers must satisfy:
• The 5-seat minimum purchase requirement for the Talent application (standalone, Unified
Operations plan, or Dynamics 365)
• Sufficient number of Talent comprehensive hiring (100 employee pack) add-ons to meet or
exceed the number of employees on payroll (e.g. 1500 employees = 15 Tier 2 packs)
I still can't understand the last point and I haven't found anything on pricing.