Until you get a new ISP, you can maybe set up a 
temporary home at one of your business 
associates, such as

http://www.rinkya.com/usagishouse/

or

http://anime-link.com/usagishouse/

Especially if you're willing to share with the 
site costs with those companies during your stay 
there.

Of course, hopefully you have all your back-end 
stuff saved on your own database servers or your 
soon-to-be-former ISP will let you redirect them 
to the new homes.

And like someone else mentioned, perhaps you can 
return to your former URL in the future.