Canna Bulbs

So i was in Lowes a couple weeks ago and noticed that they were selling Canna bulbs for $5 a piece! Then I saw you could buy 1 Canna plant in a one gallon container for $15!!! I have 30 of these growing around my yard right now and every season they multiply! I started out with 6 bulbs 2 years ago that I got for free from my parents. Maybe next season I should just pot them up and sell a bunch.