Scroll down to compare female header socket connectors at different stores and find the best price.
eBay - 10pcs Male&Female 40pin 2.54mm Header Socket
$0.99
eBay
Amazon.com - Glarks 120Pcs 2.54mm Straight Single Row PCB Board Female Pin Header Socket
Amazon.com
Amazon.co.uk - Female Single Row Straight Pin Header Pitch 2.54mm
Amazon.co.uk
Aliexpress - 100pcs Single row female 2.54MM spacing Pin socket female Header Connector 2P 3P 4P 5P 6P 7P 8P 9P 10P 12P 14P 40P
$2.10
Aliexpress