At this point it is probably cheaper to buy your own freeze dryer.
Depends. A home freeze dryer costs about $2K and has a year long waiting list. (Maybe that's down, but I doubt it.) It's big enough to do one tray of food, and takes 36 hours to run a cycle, and is sucking down electricity the whole time.
Freeze dried food is expensive. You can convert some of that expense to time by buying your own (and frankly, a huge increase in quality) but it requires you to run it almost constantly, and do all the purchasing, prep, and then packaging yourself. Also, they are huge and will take up a huge amount of space in your kitchen, garage or pantry. Most people aren't willing to do that.
That's not a freeze dryer. That's a dehydrator. It moves air (tepid or hot) over food. You can duplicate it with some screens, cardboard, and a box fan for $20.
A freeze dryer first freezes the food to solidify the water, and then puts it under hard vacuum to cause that water to sublimate directly from ice to vapor. Dehydrators evaporate 90% of the water, freeze dryers sublimate 99% of the water.
You can use a dehydrator to make banana chips and beef jerky. You can use a freeze dryer to make powdered eggs and astronaut ice cream.
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