Thumb Score: +29

Woot! [woot.com] has 256GB Samsung microSD Card for Switch 2 for $43.99 – extra 20% (30% for new customers) off with code SUPERSAVING (Offer expires 11:58pm CT, or while supplies last) = $35.19.
Shipping is free for Amazon Prime Members (must login with your Amazon account and select a shipping address in order for Woot to apply free shipping) or is otherwise $6 per order.