There are still several sellers from China offering radio (camera) remotes. Depending on which seller you find, they go for as low as approx. US$15 - 20, inclusing shipping.
People generally are wary of Chinese goods and sellers, but i have bought several, from different sellers too, and only found very fast and trustworthy sellers. And the units work perfectly fine.
People in the US and Europe have found these thingies too, and often offer them for anything from 5x the price you can get them for in China.
So before spending too much money, first search eBay and see where you can get the same items for much less.