At Costco.com, member only items, all $49.99 + $1.99 shipping, physical carts (not digital):
Splatoon 2 [costco.com]
Mario Kart 8 Deluxe [costco.com] NLA
Super Mario Odyssey [costco.com]
Super Smash Bros Ultimate [costco.com] NLA
Super Mario Bros U Deluxe [costco.com]
Super Mario Party [costco.com]
Dragon Ball FighterZ [costco.com]
(not first party, but whatevs)
Overall not historical lows by any means for many of these (especially if you go for imports) but thought it may help some folks out.
Winner on this list may be Super Mario Bros. U Deluxe -- if you can get over the fact that it's a re-release of a Wii U game -- it's $10 off and was released for Switch just about a week ago.
Games released within the last year will also get you 1% back in Nintendo estore credit (gold points currency) when the physical cart is registered for the first time on your system. Looks like Super Mario Party, Super Mario Bros U Deluxe, and Super Smash Bros Ultimate would qualify.
If you have and use your Costco Visa, that's another 2% off, and another 2% back if you're also an Executive Member.
Also available from Costco.com (previously FP deal but reported expired, is back):
$50 Nintendo eShop gift card (digital) for $44.99 [costco.com]
Available at Target.com and in-store:
Super Mario Odyssey (physical) for $48.99 with free 2-day shipping [target.com]
(use RedCard for additional 5% off)
edit: Walmart.com also has Super Mario Odyssey (physical) for $48.99 with free 2-day shipping [walmart.com]
- No longer available ->Available Again