According to a listing on US retailer Best Buy, the Dark Samus amiibo will be restocked and available on October 8th 2021, the same day of release as Metroid Dread. While there’s no evidence to suggest that previous Metroid amiibo will be compatible with the upcoming game, such a specific release date is sure to spark some speculation. Its also worth noting that the CPSIA Certificates of Compliance page on Nintendo’s Support website (which lists manufacturing dates for amiibo) has not listed Dark Samus or any other amiibo as being manufactured recently at the time of writing.
Regardless, if you are a fan from North America, this is an excellent opportunity to pre-order the amiibo if you missed out the first time.
Source: Best Buy