I don't typically use brushes, only a jag and patch, unless it's a neglected bore. In that case I generally wear out one or two brushes on the one rifle. I buy them by the dozen and pay about $1 each, last time I bought any. Either MidwayUSA ("best" quality) or ProShotProducts. I used to clean them with brake cleaner to try to make them last longer but figured I was spending as much on the brake cleaner as I was saving in brush life and just creating a "hazardous materials" situation in the basement.