cellphone buyback or trade-in ecommerce site

HI, I am look for a GREAT programmer to build me a shopping cart system very similar to what is seen on [login to view URL], [login to view URL] and [login to view URL] The web site can include a search bar (drop down menu) to select the phone, the conditions that a user can select of their device, and give the price quote to seller, payment options, checkout , prepaid shipping options and be able to track their package. The best way to figure out exactly what I'm looking for is to select a device on [login to view URL] , [login to view URL] and elegreen and walk through the process on their website in its entirety. . I have a cell phone store, I like to expand into not only selling online- but buying (buyback used cell phone like iphone etc) , I am looking for a extension to have an cell phone buyback , trade in or " buy" function in the website to allow user to sell their used cell phone to [login to view URL] web site can be html, magenta, jooma or anything can provide the similar function like the web sites I mentions above. please let me know if you can provide a similar extension, thanks