Hi GP! if you arrrre planning the full 3-axis project, you need 4 servos in all, three for head movement(nod, rotate and tilt) and one for the jaw. If you want to do just nod and rotate movement and add tilt later, you'll need three.

Here's a ballpark figure for shipping.. eight Hitec servos, shipped Priority Mail from Mineola FL, to Phoenix, abt a pound in weight.. the cost was $8.15, so figure the cost for shipping would be approximately that to send anywhere in the US('cept maybe AK or HI).

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