You can use a proxy service like Zenmarket or FromJapan to order direct from Japanese retailer Suruga-ya, who happens to have a legit copy in stock.
https://www.suruga-ya.jp/product/detail/163000231
If price is not an issue for you, you should look into that service for some of the higher-priced game you've been looking for. There are plenty of resources online with more information on using proxy services. Proxy providers can often request pictures of stock items from retailers before your purchase as well so you know exactly what you're getting. You'll be paying much less than Ebay prices, and probably have more luck that way then searching for high-end collectors pieces here.