I myself use DiscountASP. This is a fairly simple hosting, of course, a bit behind. But I just found creating a subdirectory and posting beta tests / any versions that work there very well. It is not fancy or beautiful, but it does its job.
To do this, you first need to create a subdirectory, then go to the control panel and tell DASP that the directory is an application. Then you should also consider that the web.config directory will be a combination of its own and its parent. You should also consider the robots.txt file for this subdirectory and protect it generally from prying people.
Perhaps you can also remove this with subdomains, depending on how your domain is configured.
Another option: appharbor? They have a free plan. If you can stay within your free plan, it might work (I never used them, they are currently interested in trying them)
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