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My name is ***** ***** I am a General Specialist. I have checked Amazon and fund you this set of 3 door knobs all keyed alike: https://www.amazon.com/Probrico-Nickel-Hardware-Handles-Lockset/dp/B01N9Q3HR1/ref=sr_1_6?ie=UTF8&qid=1490411861&sr=8-6&keywords=3+door+knobs+keyed+alike
I hope this set meets with your approval.
When I checked and that was actually the cheapest set. Most were $70.00 and up.