If you want to offer hair in Tirumala, you are actually directed to the many Kalyanakattas, as they are called. However if you just want to offer already cut hair, there’s a way to do it. Go to the Mini Kalyana in Nandakam Rest House. Here’s the address: https://goo.gl/maps/KhbKFLw3946o9KWf9
When you enter the building you can tell the person that you just want to offer the hair in the Hundi. That way you can enter the tonsure hall without going through the queue. Once you are in the hall, in the middle of the hall is a giant Hundi where you can drop off the hair. Pray to the Lord to accept your humble offering. That’s it.
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