MSI Nightblade MI2 PSU, i can't find it online or on ebay at all..

Aeacus

Titan
Ambassador
As far as i know, all consumer grade PSUs come with 20/24-pin main power connector.
PSUs that use 10-pin main are probably reserved only for manufacturers.

Here's link to a FSP Flex ATX PSU page,
link: http://www.fspgroupusa.com/ecommerce/retail-psu/mini-itx/flex-atx.html

From there you can contact FSP directly and ask if they're willing to sell a compatible PSU for you but i doubt that.

Another option would be contacting MSI and ask if they can sell that PSU for you but i doubt that too.

Here's also a spec sheet of a FSP350-40UGBBD if anyone is interested,
link: https://plugloadsolutions.com/psu_reports/FSP%20TECHNOLOGY%20INC._FSP350-40UGBBD_350W_ECOS%204350_Report.pdf