... series: baseball cap, sports cap, promotional/advertisement cap, golf cap, mesh cap, runner's cap, , bucket hat, kids cap, washed cap, fisherman cap, sun visor, flat cap, fitted cap, Skull cap, OEM cap, etc. ... , at first order 500pcs 2$/pcs ,next time 1000pcs 1.5$, SUM=1000*1.5-500*(2-1.5).So can test market ... of cost with 1.5$, even ...