Used PCI-E risers for sale (bought from hashratestore):

16x-16x powered PCI-E riser (19-20cm = standard): $7
1x-16x powered PCI-E riser (19-20cm = standard): $7

16x-16x powered PCI-E riser (30cm = extra long): $9.5
1x-16x powered PCI-E riser (30cm = extra long): $9.5

Freight within Sweden $12.
Will ship within EU, contact me for price estimate, but it is in the neighborhood of $40-45.

Minimum quantity: 5 risers.

Payment in BTC or LTC (Average USD-rate bitstamp/btc-e)

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https://www.hashratestore.com/wp-content/uploads/2013/04/powered-pcie-1x-16x-16x-riser-cable-molex-500x500.jpg