I never order (and certainly don't pay in advance for) anything from any supplier that they don't
specifically have in stock within their inventories.
That sidesteps a ton of possible issues down the road...and yes, that includes Amazon.
That said, Summit has a whole slew of ways to speak with them, probably more than most suppliers:
https://help.summitracing.com/app/contactus
If phone is an issue (and it always seems to have been with them, monster-sized as they are), I prefer
the "Live Chat" myself. Personal preference...
As an aside, I just fetched the oil and filters for Fred from them very recently and got the order in like
3 days, no worries. Made sure they showed them in stock.