Filling up that pot can be a pretty daunting task and is also taxing on the wallet. More importantly, it also gets tough to move the heavy pot around if you want to change things up. Most importantly, though, it is likely that the plants you've selected don't have very deep roots and such a deep pot can hinder their growth. They can also adversely affect the drainage of the soil.
Read about Ways to Prepare Healthy Garden Soil
Is there any way to get around this problem? Well, of course, there is! To put it simply, you don't need to fill the entire pot with soil. In fact, most plants require only 6" to 8" of soil so that you can fill the rest of the pot with some filler material. Here are some ideas of what you can use as this filler material. Don't worry though! Most of it is probably already lying around the house.
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Have a lot of milk jugs or broke plastic planters lying around? They're perfect pot filler material, you know! Just clean them up nicely to remove any residue, tie them together and place them at the bottom of your pot. Make sure that the drainage hole isn't covered, so that the soil drainage isn't affected.