Heart Rate Monitor

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Not sure if this is the right place to ask or not but...

Currently I'm looking for a really good HRM. One that is accurate, mostly for use of strength training. Does anyone have any suggestions for ones that work great, not much of but aren't highly price? Some I found have no reviews, I found a lot of cheaper ones on ebay and similar sites but I have no idea how good they are. One around $20 would be great, if possible but I'm open to hear any good ones. No point paying $20 or so for one that's not gonna help me out.