Been trying to get some Liqui Moly 7182 Rubber Care for over a month from ebay and placed an order with 3 different sellers.
After much waisted time following “item marked as dispatched”, eventually and one after the other, all came back with the pathetic excuse that the “item cannot be delivered to your address”.
Why? 
It’s frustrating of course and maybe I should just walk in to a shop instead, but I’m now wondering if something similar had happened to others on here.
You may find, at a guess, it’s Evri AKA “Herpes” once Hermes! Or even Royal Fail. In recent past. Iv’e lost about £100.00 of various goods between them and the senders are all doing a Pontius Pilate since the Covid years. Now I check who the carrier is going to be first.
£3.80 here, delivered tomorrow. Job done 
There’s about a hundred resellers for every genuine cheap source. Your sellers were probably ordering from the same wholesaler in Spain or somewhere who is out of stock. I notice B&Q also advertising auto products in the same way as Amazon with ‘supplied by _______’ written in very small letters in the listing and generic pictures of foreign products.
Great information.
Sometimes I trust better Amazon to deliver, if not you get a satisfactory outcome if they don’t pitch up when promised. Having said that I’ve not had any problems more recently with eBay for car parts/tools etc, just be wary of picking your seller if you can.