its very difficult to find it in small amounts thru the mail due to it being labeled hazardous material. usually you buy it from your local store. some whole foods stores carry it, some don't you have to call. keep calling around i know there is someone around you who carries it. as far as getting your son to flush, make sure the saline content is just right by experiementing on yourself, if its too low it will sting, too high will burn, make it just right. then show him how you do it and how easy it is, then tell him that if he does it will make him more comfortable and maybe take away his irritations. do it in the tub so no worries about spill, and then just calmly let the neto pot work. i think he will let it happen. good luck.