If you are a patient man you can buy them on Ebay from Chinese sellers for a lot less. 5$ for 5pcs http://www.ebay.com/itm/5Pcs-Gold-Plated-2-54mm-3x40-Pin-120-Pin-Right-Angle-Male-Pin-Header-Strip-/171004593777?pt=LH_DefaultDomain_0&hash=item27d0ab0671
for instance http://uk.farnell.com/samtec/tsw-110-08-t-t-ra/header-2-54mm-tht-r-a-30way/dp/2053194
I had not seen these before, but found some at adafruit, fairly reasonable price compared to the uaviation guys.http://www.adafruit.com/products/816
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