My MIL is VERY frugal. She NEVER buys canned vegetables, she cans all her own (grows them in her garden too), but when she opens say a jar of green beans, she refuses to toss the juices away. She'll store them in her fridge till she gets enough to make a soup with it. She also won't buy very many meats in the store. They eat lots and lots and lots of chicken and anything she can get cheap. She shops in the PX or Commissary (a 3 hour drive to the nearest one) to get things as cheap as possible. When she's in the store, she looks for the day old rack and buys tons and freezes it from there. This is mostly bread and consists of rye for $0.50 a loaf or wheat even cheaper! They NEVER eat out. If she has to make a long trip, she always packs food to take along so she doesn't have to pay to eat anywhere. Oh, I almost forgot, she also keeps a little dish in her refrigerator that consists of some sort of oil, so she can grease a pan when she needs to. She says, people who don't, waste so much! LOL
Now, I love her to death, so I'm not picking. She remembers the depression all too well I guess. She also would never purchase a computer, and she goes through her phone bill with a fine tooth comb. If it's off by $0.20, she'll call and request a credit. She does not own a CD player, let alone a DVD player of any kind. She only has a microwave because her kids(including my husband) buy it for her, and replace it when she starts saying she thinks she needs a new one. We bought her a gas grill one year, but they just won't use it. My FIL refuses to use anything but a charcoal grill.
I could go on and on, but I think you're getting the general idea.

They do however tithe 10% of every dime they make.