Hi Brenda, welcome`
I'm wondering if the place you're getting stuck isn't the very idea that what you're looking for is a 'job' when what you really want to find are clients. As a business owner your whole mentality and approach to work life and income will shift from that of an employee.
It may seem like mincing words but the distinction is very important and could very well make all the difference in the results you get from the time you're spending looking for a 'job' or a 'VA employment site' (to my knowledge no such thing exists!)
There are certainly forums, like this one, where potential client's will post RFPs and as a qualified VA you could respond to those in anticipation of a contract.
Perhaps focusing on your marketing efforts and revamping your approach there would begin to bring potential clients to your door.
I don't know if you have a website, or what you've already tried - but we have a great marketing section as well as an entire couple of sections devoted to websites, so be sure to take the time to check out the conversations on the boards.