I use the pellets, meal, Milorganite and Epsom Salt mixed together when top dressing or planting a new plant. I sometimes add in the spring (like Fred, I believe suggested) slow release plant food to the mix. I get the pellets and meal from a feed store south of my area approx 15 minutes away. I get the Milorganite from Menards.
Michele, 20 bags would probably last me forever around here.
I take it that you are lifting your plants and redoing the beds as you divide your plants for lining out????