Workaround for running subdomains mode on Bluehost?

I am runing wpmu on Bluehost.com, so far, everything is ok except I can not run it in subdomains mode, because they do not support wildcard subdomains, I wonder is there any workaround for it? I want subdomains mode but I do not wanna move my site from Bluehost, and idear? your help will be appreciated, thanks a lot!