It's well over $600 in Philly, but as a side note...the GC's are blowing out the Digitech Vocalist VR's for $250. Not a bad alternative. I use a Vocalist Access, and it's a pretty good unit. I expect the TC to be better in some ways, but it's too big for me to consider re-racking just for a small change. The most important thing to remember when using ANY harmoniser is to make it as natural as possible. Don't OVERuse it. That's an all too common problem and really cheapens the sound. Use discretion and dynamics and the result is wonderful. I'd be lost without mine. I do the Carpenters, Mills Bros, the Beach Boys, Four Aces, Four Freshman - all the pop vocal groups. (over 25, that is)
No BSB's or N'Sync yet - I'll leave that to the neXt generation of singers to cover. I'll stick to the stuff that I know will be around another 20 years.