Via Crave:

Look at older models: Headphone technology changes over the past 10 years or so have been evolutionary rather than revolutionary, and as a result, sets that came out 5 or more years ago often sound just as good as their more-recently released brethren. And after several years on the market, the list price is often significantly lower than the original MSRP. For example, the Sennheiser CX 300 earbuds once sold for between $60 to $80 online, but now can be found for less than $30.

Really?  These can be had for less than $30?  Sweet Jebus.