what I do is just every couple weeks stop by the dollar stores and buy them out I usually only spend 10-15 bucks but everyonce inawhile I spend alot more depends on what they have.. this way I dont have to go out and try to find them all at once plus budget wise its much better.. I like it this way to because then I just add alittle more media all the time allowing bacteria to partially colonize the new stiff before I pt mroe in