Howard Leight by Honeywell Impact Sport Sound Earmuff are excellent. You can get them cheap on either amazon or ebay. I got a brand new set for $30-$40 odd, however they were purple (hence the price) so just painted them when they arrived.
Watch out for the fake chinese versions though, they're rubbish and rife on both amazon and ebay, much more common on ebay. However at least at this stage its pretty straight forward which ones are the fakes and which are legit as the fakes have a few aspects to them that differ to the legit ones. The fakes pretty much dont work at all and the majority all fall apart shortly after buying.
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