If you look under the postage section on the eBay auction, it will specifically state where the seller will ship to and where not, in this case most European countries, but not North America etc, Shock! collectible horrors, I couldn't bid
Annoyingly for many modelers on this site, UK sellers will often only post to the UK, OR….. state in the description that they will ship to "Southern Ireland" (wherever that is) but do not select Ireland as a destination. Hence, anyone displaying an address not in the UK will often be prevented from physically placing a bid by eBay. I think Blaine pointed this out above.
Parcel Motel can be used as a workaround, of course