Louie, I have never had an infestation, however several of my shrimper friends have and relayed to me the challenges they have had with them. All I can do is share what they told me happened with their first hand experiences.
You always have the option of using the tank as a scud breeding tank and selling the scuds. The breed easily. A hundred of them sell for ~ $15-20 and are used to feed fish.
I hear ya about Ebay though. For the most part, that's why I like to buy from other hobbyists.