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Costco Wholesale [costco.com] has for its Members: Philips Sonicare ProtectiveClean 5000 Gum Care Edition Rechargeable Toothbrush [costco.com], 2-pack for $ 69.99. Shipping is free.

Note: $ 30 manufacturer’s savings is valid 1/20/20 through 2/9/20. While supplies last. Limit 2 per member.

I am not sure what is the difference between 5000 and 5100 but if any, looks minimal. At this point, 5100 is for $ 69.00 for a single unit while 5000 at Costco is for 2-pack for the same price.