Where do you get your information. The TP-LINK company is a Chinese company I seriously doubt they manufacture in Europe. I don't even know if tp-link builds their own stuff. Almost every electronic device there is are built by contract manufactures like foxconn in china or flextronics in Singapore. Linksys was sold to belkin getting close to a year ago and there has been little new information. Belkin will likely integrate it into its line, but linksys was never even close the quality product actual cisco stuff is....and even big cisco routers are build by foxconn or flextronics.
There are a number of places that sell tp-link in store. I know both frys and microcenter do. Tiger (ie compusa) may also carry them. You can get them overnight from both amazon and newegg.
Not sure what you mean throw them away. If you want the newer models based on the newer standards then up to you which brand you buy they will work about the same. If the ones you have meet your needs then stay with them. In any case I would avoid trying to run more than 2 of any brand. It greatly degrades the performance since these devices create direct connection to each other when you have 3 or 4 or more even though your traffic may not flow that way.