DubStudio - Home
I haven't bothered yet myself but I know plenty people who swear by dubstudio.
12 inch* £35 (both sides) £25 (one side)
10 inch* £25 (both sides) £15 (one side)
7 inch** £15 (both sides) £15 (one side)
12 inch 7-8 minutes per side
10 inch 5-6 minutes per side
7 inch 3-3:30 minutes per side