[AGUILAR3]

They sell generic gravel in small 5lb bags for $2.99 at most local pet stores. 5lbs may seem like a lot but it really isn't.

Where are you located? Maybe someone close to you can front you some gravel. After paying for gas and your time, you are probably better off buying the small 5lb bag.

 

[AGUILAR3]

Get some sand and either get root tabs or dirt (Miracle Grow Organic potting soil) as a base. In such a small bowl, a few root tabs should last a long time.