For some reason, 2 mm pitch surface mount female headers, as required by the nRF51822 Core boards are ridiculously expensive, at least at DigiKey. This is the cheapest I found, and it's €2 each, and I need two. They'll cost as much as the core board!

I found cheaper through-hole headers at E-bay, like these, which are €3.4 for 10!

However, I forgot to update my PCB layout to use through-hole headers before ordering, so I'll have to buy some expensive surface mount ones anyway. €8 for two boards, ouch!

Does anyone have a source for inexpensive 2 mm pitch female surface mount 2 x 9 headers?