Rhapsody - I hear ya about going cheap! The plastic 18 gallon bins I use cost me about $5 each. I had been using the 5 gallon buckets, but my brug trees were becoming root bound, so I switched to 18 gallon bins instead. I have one tree in a bin that is probably about 9 - 10' tall. I was shocked! Mine never got that tall until I grew them in the bins.