After the whole tarrif incident from Nintendo effecting pre-orders in the US and Canada, The Nintendo Store has now opened up pre-orders in the US that can also be delivered to Canada. Keep in mind, these are not just ordinary invites, the system is made to prevent scalpers and you will need to meet certain requirements to apply.
You can sign up for the pre-orders by going here. In addition, you will have to use a Nintendo that meets the following requirements in the quote below:
Open to Nintendo Account holders in the U.S. and Canada, who are at least 18 years old. If you are eligible, an invitation email will be sent to the email address associated with your Nintendo Account when it is your time to purchase. The invitation will be valid for 72 hours. Invitation emails will be prioritized on a first-come, first-served basis to registrants who have purchased a Nintendo Switch Online membership with a minimum of 12 months of paid membership and a minimum of 50 total gameplay hours, as of April 2, 2025. Once invitation emails have been sent to all registrants meeting the priority criteria, invitations will be sent to remaining eligible registrants on a first-come, first-served basis.
The first invitation will be sent on May 8th, and if you are chosen, will get 72 hours to complete the purchase.
Retailers have yet to open up pre-orders, so currently the Nintendo Store is the only place you can place your interest right now.