Glass cloches can be costly. You can make your own for free with supplies you may already have at home, or for cheaper.
All you need is a glass jar big enough to fit your plant. Flip jar upside down against terra cotta pot saucer. This is ideal for plants that need high humidity.
If you don't have a glass jar big enough, you can purchase a food item that is jarred and big enough for your plant that way you can eat the item and have a useful free jar afterwards! Terra cotta saucer can be purchased at your local hardware store for a reasonable price too.