The eBay site requires the seller to identify precisely how many of a product are available. But this doesn't work well for vendors who make models "to order", carry no stock, and sell under the "buy it now" sales option rather than sell by auction.
Therefore, in order to sell on eBay, the common practice among 3D-printing vendors is to state a modest quantity are available, typically 10, in order to satisfy eBay website functionality, and then assign a handling period that gives the vendor sufficient time to produce the model. As sales accrue and the available quantity decreases, the eBay site will automatically reset the quantity to 10. This auto-reset method benefits the seller because the seller doesn't have to pay a costly new "listing fee" after each sale.
It may appear at first glance that this is a deceptive business practice but in actuality, it is nothing more than how a made-to-order sale has to be done given the way the eBay site works.
This gets more complicated for Chinese vendors and others who aren't fluent in English and therefore uncomfortable operating on eBay, handling international taxation, and/or engaging directly with customers on other continents who speak a different language and use different written characters. Those vendors may prefer to sell through a 3rd party that is comfortable with eBay. Working through an extra party can result in additional time needed to get the model.
If ever in doubt, contact the seller and ask if the product is on hand or must be produced after the sale. Reputable sellers will be able to answer that question and provide the potential buyer with a reasonably accurate production time estimate if the model needs to be made or obtained from the maker.
Likewise, if you need more than the stated available quantity, contact the seller and he/she may be able to reset the quantity manually to offer what you need.
Hope this helps!
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