So it seems I have a small leak on the left bank on my 2010 xf supercharged.
Joy.

What are the best places to order parts from? My shop is very cool with keeping parts cost down since I am paying their rent in labor.

Thanks for the help everyone.

the Saga continues.

I'll ask British export company who has aftermarket gasket sets with whom they work in USA

Have you looked through the vendor links on this forum? They can be found under the 'Marketplace' heading in the drop-down menu.

the vendor list mostly has suppliers for older models.