I am shopping for this, too. Thanks for reminding me to look up reviews. The retailers they list for each model are in parentheses. These are all arm cuff (not wrist) models.
Consumer Reports – October 2020 – Best Blood Pressure Monitors for $50 or Less
A&D Medical UA767F (Walmart & Amazon)
Equate (Walmart) Equate 4000 series
Omron Silver BP5250 (Amazon)
Rite Aid Deluxe Automatic BP3AR1–4DRITE (Walmart & Amazon)
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NY Times Wirecutter – July 2019 – The Best Blood Pressure Monitors for Home Use
The best home blood pressure monitor
Beurer BM55 (Walmart & Amazon)
This monitor provides consistent readings, is easy to use, comes with a cuff that can fit most arms, and has a large, backlit display. It also offers ample on-device data storage for up to two users.
Budget pick
A&D UA-767F (Amazon)
A simple monitor for up to four users
Consistent and easy to use, this no-frills monitor can store blood pressure readings for up to four people, and its adjustable cuff can fit most arms.