Dried apples are a healthy snack for kids. Because my mother has lots and lots of Apple trees, I always am trying to find ways to preserve my apples.
Last year I bought this dryer. It works so great and I love it.

I also bought this Apple Slicer, peeler, and corer in one. I love this and my kids LOVE how the apple comes out all hooked together and sliced and peeled. This is a dryer item that I bought for 17.95, but I have found that my kids like to have their apples cut this way. So I keep it in the pantry all year round, for quick access. I can get them to eat tons of apples if I slice them this way. I am really careful that if they want to help me I only let them turn and not put the apple on and off. They could get hurt doing this. My kids love to take the dried fruit off the trays and they love to put the fresh fruit on the trays and take them to the machine. I think it is great that they help me with this.

I only bought this stuff last year. What if I couldn't afford it then? Here are three ways to do the same thing I did, with resources you have.
Dehydrator or Oven Drying
1. Cut apples into wedges and slice into 1/4-inch-thick slices, or slice the apples into rings.
2. Dip apple slices in an ascorbic acid mixture (1/4 c. lemon juice to 1 qt. water) - to keep them from turning brown as they dry.
3. Place the slices one layer deep on kitchen trays. Do not overlap the slices.
4. Dry at 115 degrees F for 6 to 8 hours. Turn the slices after 4 hours and rotate the trays if needed.
5. Test for dryness after 6 hours and then every 2 hours until no moisture remains in the center of the slices.
Sun Drying
1. Prepare the same way as above.
2. Cover with cheesecloth and place in a well-ventilated area in full sunlight.
3. Turn slices every few hours.
4. Take trays inside at night. Drying takes two to three days.
Spices: I like to change up my dried apples. I have put before: Cinnamon, sugar, brown sugar, Carmel, and cayenne pepper on my apples as they were drying.
My last thought was what do you do if you DON'T have apples to dry. Last year my two sisters in law answered this question. They drove around town and looked for apple trees that were not being picked from. They got over pride and went and asked if they could have some. Everyone said take as much as you want, and were grateful someone could use them. Both of my sister in laws have over 19 kids between them and needed that extra blessing.
If you DO have money to spend, go to a local orchard and pay for the apples.
Not related at all to drying apples, but my last tip of the day is that if you are making applesauce (bottling or fresh on the stove) throw in a few red hots. It will make the color pretty and give a hint of cinnamon.