Some canopy adjustment knobs are universal for many standard two and three person seating models. Try TSY Services, in Santa Fe, CA. You might need to send them an email with the photo of your knob. 562-207-9070. If you need a replacement canopy your best bet is to buy a durable one from swingcushioncovers.com. They use only Sunbrella fabric which comes with the outstanding 10 year fabric warranty.
Replacement light bulbs can be found in many hardware store and wholesale stores including Walmart, Costco and Target. You may also find them on Ebay.com
At WALMART
Ebay.
www.costlesstarps.com
I have heard Costco did buy some land on the east side of I15 just south of lowes hardware. Not sure when Costco will built it
If they sell batteries, then yes.
www.costlesstarps.com
You can get quality replacement speakers from Best Buy or Future Shop or Costco. They have good selection of brands of speakers and knowledgeable sales representatives.
Gardenwinds.com
http://www.servicesupportlink.com/umbrella-parts.html
http://www1.uk.shopping.com/xGS-replacement%20parts~NS-1~linkin_id-8016515вℓєѕѕ вℓєѕѕ¢уα
You would have to find out the manufacturer, then call them.