Best place I have found is
www.dealextreme.com
short (300mm) $5.31 for a 10 Pack:
http://www.dealextreme.com/details.dx/sku.11985
medium (500mm) $6.17 for a 10 Pack:
http://www.dealextreme.com/details.dx/sku.11986
long (1000mm) $9.49 for a 10 Pack:
http://www.dealextreme.com/details.dx/sku.11987
and the Y-Cables $7.37 for a 10 Pack:
http://www.dealextreme.com/details.dx/sku.11984
They will ship directly to you from Hong-Kong via the Kong-Kong equivilent of USPS Priority mail. Last time I ordered some I got them in a couple of days.
The quality is equal to the ones that came in the KoP this year or better. The Y-Cables are heavier gauge than the ones we usually get in the KoP and the regular ones are the same as we usually get. As with the ones in the KoP you will have to snap the shroud of one end and cut off the little side tab per these instructions:
http://www.usfirst.org/uploadedFiles...ble%20Memo.pdf
Come to think of it our supply is running low. Time to order some more!