There are a whole host of sites and stores available where you can find USB gadgets. Everything USB is a company that specializes in this type of gadget and their website has a large range of USB gadgets to choose from.
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A good place to search for a USB serial adapter would be on the website tigerdirect.com. The website provides multiple matches for your search to offer competitive prices.
There are a host of different places where USB AC adapter are available and can be purchased online. It's always good to have an extra USB AC adapter. Electronic special stores like Radio Shack are also a good place to find the right charger for you.
You can find all sorts of technology at 7dayshop. This includes laptops, photography gadgets, iPad stuff, ink/toner, flash memory and USB drives and more.
its a port to insert usb gadgets or cables to connect them to your pc. for example the ipod charging cable(used to either charge or to syncronize your ipod)
BestBuy or Walmart
There is no place to buy a USB recovery program. You need to first purchase a USB flash drive (these are relatively inexpensive), then you need to put the recovery program on the USB (such as a Windows recovery), You will then have a recovery program on a USB.
Radio Shack is a good place to find out more information on this product. Walmart also sells the item. Transcriptiongear is a website that retails recording equipment.
There are now a wide range of USB toys and gadgets available. Companies producing these items include Lego, which has produced a programmable Lego brick under the NXT name.
You can go back to the store where you purchased the computer and ask for a good quality USB Ethernet which is cheap or search in amazon.com for the cheap & top qualified USB Ethernet adapter.
http://www.slashgear.com/usb-security-lock-a-little-hardware-security-for-your-pc-047772/ is a good site to start with to find a USB security lock online.
One can purchase a spare USB hard disk online at eBay or Amazon. Another option would be to purchase it at a computer and gadgets store such as The Source or Best Buy.