Yes, Sony wireless speakers are sold at Best Buy. To find out what the pricing is and more specific details, you will need to go to www.bestbuy.com/.
The following retailers carry wireless surround sound speakers: -Amazon -Best Buy -Costco -Currys -Sony -Future Shop -Harvey Norman -E Bay -Walmart -Samsung
Depending on the brand of speakers, the web site amazon.com offers a wide selection of replacement parts for many types of wireless speakers, such as Sony, for low prices. Also, many companies that manufacture speakers offer replacement parts directly from their websites, so that you never have to question weather a part is compatible with your speakers.
Try sony's website. Also websites for different electronics stores such as best buy or radio shack. You can even try amazon.com as well because I'm sure they have sony speakers there for cheap prices as well as with free shipping
Wireless computer speakers can be purchased from several locations. Some of the best places to look are at www.bestbuy.com and www.macmall.com
Cheap speakers can be purchased on eBay. Depending on the seller, you can find some cheap speakers. On this store, the items may be super cheap but you might have to bid for it.
You can find replacement speakers for a Sony home audio system by checking the Sony Style store online for spare parts, or by looking on EBay in order to find a good deal.
You can purchase some good and cheap car speakers from Halfpriceaudio.com. You can also purchase good quality and cheap speakers from Kmart and caraudiodiscountplus.com.
You can find Brookstone wireless speakers from the following sources: Brookestone, Amazon, Bed, Bath and Beyond, Sears, Staples, Wired, Logic buy, to name a few.
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Wireless speakers and other wireless electronics can be found at www.amazon.com for very good prices and a lot of times even free shipping. You could also check www.ebay.com.
You can most definitely find Sony floor speakers online. I'm pretty sure you can find them at any electronics store such as Best Buy, Frys, RadioShack, etc. Hope you found this helpful :)