heres what i would do in this EXACT order. go to the vancejackson walmart on i10 ...7am-8am ish...IFFFFF you dont get the good bulk (100 count) FMJ ammo cheap...(which u probably WILL!)..at 8am go to the vance jackson and 410 academy (they open at 8am) and get ammo there. but walmart would be ur best bet (ive gone there at 8am ish and gotten lucky..but they stock around 7am i thnk!) walmart/academy. walmart= u can buy up to 300 rounds per caliber (or MORE), but academy= 1 box per caliber per day. (unless u go later on in the day) ...so..yea.