I spend about $25 per boy per year for clothes. Granted, the younger one wears a lot of hand-me-downs. Fortunately, boy clothes seem to go out of style more slowly than girl items, so I am always shopping one year ahead. My favorite thrift store in an upscale area has 25 cent clothes days about once a month, so I hit them up then and stock up on the next size or two up. I even get their shoes from thrift stores. Boys grow so fast, it's shocking how many pairs of tags-still-on shoes I find for only a dollar or two. My almost 13 year old is currently wearing a new pair of Columbia hiking shoes I scored for $3 on a half price day. My youngest is wearing Keene sandals that were barely worn and scored for a $1 at a garage sale -- the mom had purchased them on sale in the winter, and her son outgrew them by spring. Our local Goodwill even has bags of brand new underwear and socks for $3 for six pairs. I have a very fashion conscious almost-teen, and he prefers thrifting because he can find items that none of his friends are wearing.
I guess the JBF sales vary in quality by area. I went to ours once a year or two ago and it was mainly overpriced designer toddler and baby clothing, and primarily girl stuff. I do much better thrifting.