My experience (considerable, particularly if you incidental the dozens of tins of McClelland I bought over about 18 months using a seemingly evergreen coupon code from Cigar Dojo for 15 or 20% off which you could every now and then stack with another promo such as free shipping) is that if they show it in stock and the system lets you order it, you get it. They don‘t do backorders. The one time this proved not to be true they credited my PayPal account in just a day or two. They credited my account for the regular price, even though I had gotten a 30% discount. I sent them a check for the difference, maybe $12 or so, with.an explanatory note. About six weeks later, I got an email from someone in accounting thanking me and telling me they were tearing up my check.
I know others have had different experiences, and sometimes it seems when they screw up it is really a doozy, but I have been a satisfied customer for decades, even before I became a pipe smoker.