The channel offers versatility while remaining affordable.
 
This package comes with
2 Channel sections 
2 top stabilizers
2 connectors.
This setup will allow you to create one straight 5 foot channel or one curve equivalent to a 15 foot curved tunnel. Or, you can fold each section onto itself for form two uprights for foundation work.
 
When you are ready for a longer channel, simply order another kit and add to what you already have!