I got a US Blaster multimedia stereo headphone microphone headset through a friend's trade account for a little over a fiver, which works well.
Using Skype previously, the caller could hear an echo (probably from my speakers), so I got the headset and a twin jackplug output from a single jackplug adapter for my soundcard.
The adapter goes into my soundcard's speakers jackplug socket and the double section carries the speakers jackplug and that of the headset.
To use the headset I switch off the speakers and turn up the headset's volume control and vice-versa.
Incidentally, apart from the click here website, the only other reference I found for the headset was on a Romanian based web page.
The price was nearly 400 Romanian coins of the realm. When I checked out the purchase cost there it turned out to be just 76p...:-)