Can your own meats. The pressure canner costs around 70 bucks. Meat is easier to can than veggies. All you do is put the raw meat in the jar, wipe off the lid with vinegar moistened napkin, put on the lids and process. Label and store. You can put water or broth in the jar before canning -optional, but I like to have the added liquid.
The meat is very tender and tastes great. Once I learned to do it, that became my new Fast Food.
Eggs - They say the life can be extended by covering with oil and putting in the refrigerator. And also there are instructions for freezing them - I haven’t really tried them out though.
Eggs...The life-extension with oil is likely because it keeps oxygen from permeating the egg shell.
I am guessing you know about the fresh egg test where put egg in water and see if it floats...If it floats to top, it is bad due to too much oxygen.