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There are a lot of factors here. How much area do you want to cover? Inside only or outdoor too?
How far would the speakers be from the source?
Wireless speakers are generally not a great option, they have reliability issues, often have poor sound quality, and can be quite expensive.
If you have the option to, you would be better served by having wired speakers installed (you'll generally need attic or basement access to run wiring).
Even with the cost to have someone come out and run the wiring and do the install, you'd probably still be about half the cost of a wireless system, with far better quality.
If you tell me a bit more about what you're looking to do, I can give you some more specific answers.