Here's what I use:
They only cost about $15 USD. I was feeling like my hearing should be worth more than that so I went to the audiologist and got fitted for the expensive ones. To be honest, I couldn't really tell the difference between those and the Hearos-style plugs - they both let in some amount of high end to give a more even frequency attenuation and both knocked the dB down by about the same amount.
Anyway, not long after I got the spendy ones, my dog severely chewed one of them. Oh well.