I have this one and it appears to be quite accurate. I tested against my doctor's.
[ame=http://www.amazon.com/Omron-Series-Upper-Pressure-Monitor/dp/B004H468S8/ref=sr_1_6?ie=UTF8&qid=1375144819&sr=8-6&keywords=blood+pressure+monitor]Amazon.com: Omron 7 Series Upper Arm Blood Pressure Monitor: Health & Personal Care[/ame]
It is also available at Walgreens.
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