Gamesmen is the only store accepting pre-order at the moment.
Pre-Order: Due May 2024
Maybe Amazon and other retailers will join later.
I know this is RRP but this 3-pack has been going for over $200 on Amazon & Ebay for a few years.
Individually they are being sold for $21.95 each.
Alot of the Mario and SSB amiibo has been restocked recently for Mario Day.