Nope, if your slave is working, no need to replace it.

I bought my MC from an online parts supplier that doesn't exist anymore. I believe there is a honda-acura.net sponsor that sells parts like this. You might want to check the vendor area of the forum. Otherwise, you might find it on ebay or by a google search. If you can find a new one from any source other than the dealership, you're in good shape. The dealer will charge probably double the price you'll find elsewhere.