Some VAC amps have both single ended and balanced inputs and outputs. I believe others, like the Music Block series are just single ended.
05-07-07: Blindjim
wow. I was under the impression the VAC amps were intended for use in balanced mode. And they run for under 3K?
I saw someone selling a used VAC Renaissance 30/30 recently for $2500.
You cannot buy new VAC amps for under $3k, as far as I know. But, VACs are built to last a lifetime. In fact, there is a page on the VAC website called the "VACtory Store" where used VAC gear is occasionally listed for sale.

