Instead of the "Pro" version, Antares offers . It is a lighter, much more affordable version that gives you the core "Auto-Tune" sound with a simplified interface.
If you have literally no budget, (Free Edition) is a pitch correction plugin for Mac that rivals vintage Auto-Tune 6. It has real-time tracking, a throat modeling filter, and zero malware. The free version creates a subtle watermark (a brief background tone every 15 seconds), but for practice and demos, it is unbeatable.