[OpenAlgorithm]

Instead of looking for a typical outsourcing company, why not look for a blogger or forum member (stack overflow or HN) that answers questions/writes tutorials on the topic you are struggling with.

Contact a few with the offer of a small bit of work and I'm sure if you email enough people you will get a response.

By already viewing their work and being able to hand pick only the best you will ensure that their work is top-notch.