Sweetwater has the Electro-Harmonix V256 Vocoder for about $215. Sometimes having hardware is better than software and lately there are a lot of products priced so you can go either way. A like having my Digitech Talker as a separate hardware box because it’s easy to plug a real analog synth and mic into it. I know you could stay soft (vocoder wise) and route audio out of you computer and back in again but are you really going to take the time to do it?
“Bend your gender, drone your tone and invite aliens into your work of art. You want flexibility? The V 256 lets you adjust the vocoder from 8 to 256 bands taking you back to the 80’s and propelling you into the future at the same time. Bring your vocals up to snuff with advanced processing “Reflex Tune”… today’s most popular pitch correction effect.” – ehx.com/products/v256
For more info: ehx.com/products/v256