Make a list of what props you will need for your movie. Do you need furniture or trees and rocks? An airplane or a glass of wine? Deciding what movie props you need will help making them much easier and will help you choose between buying, borrowing or physically building them.
Decide which items you need to have a three-dimensional item for and which items are needed for effect. You may need a dish that can be picked up and moved around but the illusion of wallpaper, or even a landscape in the background, can be created with paint.
Look over your list for items that can be borrowed. If you know someone with model airplanes then ask if you can use them instead of spending the money to buy or build your own. Borrowing can even extend to things like someone's backyard if you have a scene that involves trees and a swimming pool.
Buying some of your props is much more realistic than building them, especially for household items such as dishware. Visit garage sales, flea markets and secondhand stores for movie props that may cost you next to nothing. You may even find items such as lumber that will help you build your props.
Building your props can be done with several materials, such as wood, metal and Styrofoam. Some of these materials can be found even cheaper by asking your friends and families what they have that they would be willing to get rid of or by asking construction sites if you can take the materials they do not use.