Walmart has the First Secure by Schlage Deadbolt & Rigsby Door Knob (Stainless Steel) on sale for $12 with free shipping with Walmart+ (30-day trial) or on $35+. Also in Brass for $15. Comes with 2 keys. Also on sale:

• First Secure by Schlage Rigsby Bed / Bath Privacy Door Knob for $5
• First Secure by Schlage Rigsby Keyed Entry Door Knob for $7
• Brinks Interior Non-Locking Passage Ball Doorknob for $7
• First Secure by Schlage Deadbolt and Keyed Entry Hawkins Knob for $15