I had this discussion with an unhappy camper offline:
LuckyModel doesn't monitor the 1000s of items on their website that carefully. Is that wrong of them? Heck, who could keep up with it all? Manufacturer A suddenly decides to discontinue a whole line of products (as Eduard did recently), imagine all the work of going in and immediately deleting those SKUs... You think your models are getting to you slowly now....
A little "common sense" is needed here: first of all, if an item is listed as "available," it means LM doesn't have it in stock. If you have any doubts, email them and ask when they think they'll get a re-stock. If it's an obscure item (e.g., Eduard's PE upgrade for the old DML M46 Patton) and you can't find it anywhere else, what makes you think LM will get it again just because it's on their site?
Finally, if after 6-8 weeks your order still isn't shipped, reach out to LM with an email and say "are you ever going to ship?" If they can't get it, they will cheerfully refund your money or substitute something else.
They've very lovely people to deal with. I don't see anything here but a clash of expectations. A little care and common sense on our part and everyone will be happy.
And no, I don't have any financial connections to LM, I just like their prices and service.