ProAudioStar has the Focusrite Saffire Pro 40 on sale for just a hair more than 50% off.
regularly $399 but now for $199.99
I ordered one on Friday and it was delivered on Tuesday.
I'll use it as a backup & but have it connected right now via adat to my motu 828mk3 (for the extra inputs)
This audio interface is firewire - but can be connected to a thunderbolt 2 port (on both PC's or Macs) using the apple firewire to thunderbolt adapter (retails $29.00 on amazon: https://www.amazon.com/Apple-Thun...00SQ2CJUS/
If interested in going the thunderbolt route - here's some more info:
Connecting the Saffire Pro 40 to Thunderbolt ports: