FU - advice on tree pit guards / curbside planters

[mattkime]

Follow up to - http://forums.macresource.com/read.php?1,903861,903944

I found something that serves my purposes -

http://www.homedepot.com/h_d1/N-5yc1vZ1x...?langId=-1&storeId=10051&catalogId=10053

I was curious if anyone could recommend similar products. I'd probably need to buy about 20 of them so something just a bit cheaper would be nice as well.