Sadly many models, (kits, diecasts, built) are much harder to find at Goodwill or any thrift type store now days. I used to, 3-4 years ago, see models cars, trucks, planes ships and occasionally figures on a frequent basis like 2 times a month. Now days it is a rare thing to see anything, maybe 1 time in 3-4 months. Even the Hot Wheels types regardless of condition, are more scarce.
Of course I may not be "at the right place at the right time" but as we go to various thrift stores 4-5 times a week I don't think that is always the case. So I tend to agree that many stores now seem to be useing the internet as their sales tool and cutting back use of the store shelves.
A result of our new digital age I suppose--sigh, I so old😢