Hi,
of course there are plenty of options.
here are my suggestions
- using bad, really bad black hat SEO techniques [ this will pay off

in long term run and you'll never see your customers' site in SERPS

]
- banning search engines using .htaccess (mod_rewrite or similar)
- is your site is dynamic banning is done by checking for user agent programatically.
disclaimer:
use this info at your own risk
Svet