I think a Dryer handles 35 amps.
I am over 30 amps with the 6800 I have going. I have a dehuey, AC, Co2, Fans, etc running off the regular outlets.
as far as how much?
a new breaker, a plug and labor is prolly around $120
a 12kw panel with timer and start delay, between 2 and 400 depending on who builds it.
dxsoundco builds a good....if not superior product. nowirenuts builds a great, but pricey one. and powerbox makes em for around $600
I am running 6800w off of a Dryer outlet with this.