Anywhere online, or at gaming stores such as GameStop. You can buy used or refurbished PlayStation consoles. It tends to be better to buy slightly used consoles rather then refurbished, because refurbished systems tend to have more problems.
There are several online stores that sell used or refurbished tractor parts. One of these websites is powersourceonline.com.
Refurbished laptops can be purchased online at the Apple Store on Apple's website. There is a link in the sidebar, which will then show all the options for refurbished iPads, iPhone, Macbooks, and iMacs.
There are many places online where people sell used ipod. I would tend to look for refurbished ipods sold through established businesses; that way you get a warranty. You can buy refurbished ipods on Amazon.
One can purchase a used iPod on eBay, Craigslist, and Amazon. If one would rather buy a refurbished iPod, one can buy one at Apple's online store, Gamestop, and Amazon.
The Compaq TC1100 is discontinued and is no longer sold new. You can purchase this item used or refurbished online from auction websites such as eBay for roughly $100.
There are a few places that one can purchase a refurbished Xbox 360. Kijiji would have used or refurbished Xbox 360 that are being sold by an owner, as well as Craig's List. Another option would be to shop at Future Shop or Best Buys as both of these stores would sell the Xbox 360 there as well. If one wishes to purchase a cheap refurbished Xbox 360 online then one can use the websites eBay as well as Amazon. On both of these websites one can find great deals as well as customer reviews.
A used Xbox can be found for sale online at both Amazon and eBay. These sites feature sellers selling both used and refurbished Xboxes and Xbox 360's online.
The average costs of sony erricsson W800l is $75 for used while for refurbished they might go up as high as $ 130 if you do purchase the phone online on places like amazon.
Craigslist
Used cell phones are available for purchase from many on-line retailers. You can also check your local area for retailers specializing in the sale of used and refurbished cellular devices.
Used PCs can often be found for sale from websites such as Jamie's Computers or eBay. One can alternatively purchase refurbished PCs from most software companies, such as Dell.