(I can widen the topic)
There is also a general toll.
Here it can start happening when item price exceeeds 150 euros.
The price is without extra costs and toll varies between product categories.
I'm quite sure that that kind of nuance is globally excluded.
Not a biggie though, if the toll is not a biggie.
Bigger issue is that rejection.
You have made a committment but can't fulfill it.
A very long while back. Foreign transactions on ebay, was usually/sometimes, fairly quick, cheap, easy and fairly straightforward. Small/light items, could be bought from many US ebay sellers, such as components, in small packet form, for around $8/$9 extra, and could have arrived within around a week.
Very heavy items were (arguably) too expensive for fast air-freight, e.g. old but good analogue/crt oscilloscopes.
But there was fairly reasonably priced (but very slow), 'ship' (rumored to still be air-freight), low cost delivery, but which took around 6 to 8 weeks to arrive (customs permitting).
Ebay sellers were often nice, honest, friendly and easy to deal with, then.
Also, components were usually genuine new old stock (none of those potentially fake/rejected/reused/scam Chinese components).
Low cost items were normally always free of any VAT or import duties, below a given threshold (in the UK).
Expensive items, in theory, had reasonable custom charges added to the total/bill, when it arrived.
These days, it has become a nightmare (opinions may vary).
Many sellers (ebay) refuse to deal with people in the UK (even big established companies can refuse non-VAT registered, individuals, these days, there have been thread(s) here about it).
We now have crazily over-complicated VAT rules, crazy rules insisting that the tiny (relatively) seller has to register with the UK (or EU for EU countries), just for YOUR transaction, and fill out many pages of complicated info, just to supply you with your $1.99 transistor (which is completely mad/crazy).
No longer any minimum (free) thresholds, so your bargain $0.99 packet of transistors, needs to go through tons of hassle, for the $0.19 VAT bit.
Postal charges have gone through the roof (too expensive, but not always, it depends on the countries involved, other factors and what one thinks as too expensive), as you just said, on higher total amounts, extra import duties (on top of the VAT and other possible add-ons to the bill), can/will also apply, which also has complicated rules associated with it.
The carriage companies (UPS/DHL etc), can than add on eye wateringly high additional fees, for processing all these extra charges, which can also add e.g. another $20 to the bill.
The uncertainty of how high/huge the total bill payments are going to be, makes it very difficult to work out if an apparent item is a bargain or going to be too expensive (overall) or not.
Not long ago, we (in the UK), could buy a bewilderingly large range, of amazingly cheap (electronic) items from China/Ebay. E.g. 4 or 8 digit, 7 segment LED display, with Arduino ports built in for next to nothing, including free postage. E.g. $1.99 each (estimate). Or even a complete MCU mini USB powered development board (such as a blue-pill or similar), for something like $8 or $16 (version dependent, (ST) 8 bit cheap, 32 bit arm more expensive) for 10! of them, including postage. I.e. around $0.80 each (if buying 10 at a time) for a complete ST 8 bit MCU board, with reasonably specifications.
Whereas nowadays (after all the VAT changes), many of the (from China) items seem to have disappeared, and the (total including postage) prices seem to have doubled or more, in general (maybe not in every case though).