This lab offer many different tests. For intestinal diseases or diseases that might originate in the intestine only, they have tests for leaky gut, SIBO, CSF, IBS, IBD, fibromyalgia, celiac, metal toxicity and of course parasite infection; they have now changed their name to Genova diagnostics but are still located in NC. Here is a link to their parasite test page
I would have have to check my archives to give you the exact amount I paid for the tests I had done--parasites and candida--, but as I recall, it was around $ 200 two or three years ago.
Detecting parasites in stools is a very difficult job; don't waste your time and money with ordinary labs; most of the time, they won't find what you have.
I had several tests done by different standard labs in DC before I contacted Great Smokies--only Great Smokies found I had D. Fragilis.
hope that helps.