Just buy one of ebay. They ship them from Hong Kong to pretty much anywhere you want.
Everything that is more than 25 bucks is a waste of money. There isn't really any quality difference among the lot. They either fit or the don't, They either work or are broken. It is just an Adapter in a way like the adapter you need to plug your UK power plug into an US outlet. Either energy gets through or not.
That stuff costs less than a doller to produce and 20 $ is already quite expensive.