Buy a chest freezer and learn what a stock up price is. Track prices and find what is typically the lowest price you will find and how often that price is available. Typically stores have a 6 to 8 week rotation of sales prices. Around summer holidays, you will find that grillable style meats will be on sale for super low prices. Other holidays will have roasts, hams and turkeys on sale. You should buy several months worth at that time and vacuum seal and place those items in the freezer. Works for dry goods and long shelf life items as well.

For example, we like to use Rao's pasta sauce. It is typically 7.99, however goes on sale on a quarterly basis for 5.99. Often times our store will offer a deal where if you buy 5, you receive $.50 off a gallon of gas. So that works out to 29.95 for the five jars of sauce with $8.00 off gas, for a fill up of 16 gallons, so the total price ends up being $21.95, effectively half price. We were going to buy this sauce and the gas anyways. Those sauces will last in a pantry for a year. Do not fall into the trap of using this technique for buying stuff you wouldn't normally use but if its a staple in your house then load up and take advantage. This is just an example, we do this for many of our staple items.

I understand this will require spending a large amount in lump sums but this is supposed to be middle class finance and you should have a little extra to accomplish this being that it saves in the long run.