I've been using Ronstar for the last 3 years in my beds (3 acres of land and probably 1 acre of areas that I want pre-emergent weed protection) and it seems to have been fairly successful but it is so expensive here $110 per 50lb. bag (12,000 ft coverage per bag). I have never used Snap-Shot as my local dealer (United Hort. Supply) does not carry it. I have read about it and it seems to be the favorite of many for pre-em on flower beds. I have been applying RonstarG to my beds each Feb/March and my dealer tells me that If I apply each year that it works better each year at creating a barrier. Is this true and does Snap-Shot do the same thing and how often should it be applied? Also, are there any good websites or wholesalers for buying fert/ herbacides at lower prices?