Cyclesmith has always been great about ordering the Fox stuff I’ve needed- seals, fluids, small parts, travel spacers etc. I just email mark@cyclesmith.ca with the Fox part number and he lets me know the ETA and price.
Having said that, buying a CSU is pricey so there might be a deposit required.
What did you need? 32/34/36? Tapered or straight? 26/27.5/29?
Yeah, cyclesmith would be your best bet. Like above said, email mark. I do the same thing. Technically, mark doesn’t do the ordering anymore but I prefer to work with him. He might refer you to the new (spo) guy but don’t take it personally.