Ask HN: What are good places to market services?

Obviously Ebay and Amazon are good places to sell products but usually not services. Also, are there big players that are not centered in the U.S.?

For a little bit of background: My website, ktbyte.com, does automated java tutorials. Some of the full classes (200 lectures/problems or so) will be on sale for 90% off this summer, and I'm not sure how to get the word out.