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Amazon [amazon.com] has Westcott 29691 All-Purpose Rosewood Handle Letter Opener, 9 in for $0.72.
Shipping is free with Prime or on $35+ orders.

amazon.com/dp/B0017OT74I [amazon.com]

Walmart [walmart.com] also has 9″ Westcott All-Purpose Letter Opener w/ Rosewood Handle for $0.72. Shipping is free w/ Walmart+ (free 30-day trial [walmart.com]) or on orders of $35+.