Anyone know a good place to buy PCI risers, version 5 or 6
On ebay, several models of version 5,6 and 7.
Do a search with “riser usb” on ebay, and look at the photos to see the version.
Here a version 006C:
http://www.ebay.com/itm/142299578087?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
taobao.com has them for ~5USD, you need to understand Chinese to use the site though.
Alibaba’s a great place to start if you want to buy in bulk for ~4USD or even find the manufacturer themselves and deal with them.
All would be shipped from China so it’ll take a while for delivery depending on your location.