I bought a pair of electronics from Gander Mountain last year for about $35. They are entirely acceptable. Electronic or not, I wear foam plugs under the muffs for really loud guns.
I've used electronics that cost anywhere from $35 up to $350 in muff and "hearing aid" style. I found them all satisfactory, the extra money mostly pays for reduced background noise and/or interference. To me, it's not worth the money. Others find the noise much more distracting.
I always use electronics of some variety, they're especially great for hunting.
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