I think you might also benefit from the same list of Master Gardener Landscape Professionals who offer landscaping services I recommended to Joe Panzetta today. (Joe  asked Q-Land for a referral to someone who might be able to cut and edge his lawn.)

To obtain the list, e-mail  Elaine Anderson, WSU Extension Master Gardener Program Coordinator, at elaine.anderson@wsu.edu and request the  Master Gardener Landscape Professionals (no endorsement implied). From the list, you can make calls and get information related to individual services, pricing, etc.  If when you contact the individuals on the list they do not provide what you are looking for, be sure to ask them for referrals.    

Here's a final thought:  I also recommend asking neighbors or, if you're driving through the neighborhood and see someone working in the garden, stop and ask if they are available to work in other gardens.  Heck, the worst thing that could happen is he/she is the homeowner and you both have a good laugh! (Yes, it happened to a friend while he was working in the garden and a new neighbor thought he might be the gardener!  He thought it was hilarious.).  Anyway, I've had someone helping me in my garden for the past 5 years.  During this time, neighbors have stopped and asked him if he could work in their gardens  and he now has enough clients to keep him busy throughout spring, summer, and fall.

Wow, a Grey Gardens landscape . . . sounds like a lot of work!