I have these. They are cheap and good. well under $50. I've had them for maybe 3 years. The plastic around the adjustable part did start to crack from putting on and taking off my big head. I used black ducted tape to fix and has been fine. There is also a closed ear version that always for some reason goes for less. I like these because i can hear if my phone rings or the doorbell. The sound is really good even though the construction is all plastic. I've had old headsets that just fell apart on me and cost much more.
http://www.newegg.com/Product/Product.aspx?Item=N82E16826265065