Ring has Ring Retrofit Alarm Kit (White) on sale for $149.99. Shipping is free (via 2-Day or Ground shipping). Thanks codepyro
Note, requires the Ring Alarm Base Station to function properly.
Editor's Notes & Price Research
Ring Retrofit Alarm Kit conveniently connects your existing hardwired contact sensors to your Ring Alarm System. Existing wired contact zones must be in good working condition. Offer valid while promotion last - Discombboulated
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Edited July 21, 2020
at 12:40 AMby
Have a wired alarm system? Make it smart with Ring Retrofit Alarm Kit – a wired-to-wireless bridge that conveniently connects your existing hardwired contact sensors to your Ring Alarm system. Requires Ring Alarm Base Station.
$149.99 is $50 cheaper than lowest price according to CCC and it's the first time I've seen this on sale.
EXPIRES TODAY 6/21 at 9PM PST QA Update: Still available 7/21