There can be other piping options found at a plumbing supply warehouse or irrigation supply in your area. HD supply might be an option. You can also check out thebluebook.com which is the yellow pages for contractors.
If you are looking for a hard pipe at a lower cost check out SDR 35 sewer pipe. It's also a hard pipe similar to Schedule 40 pvd but the wall thickness is less and tends to be a little for giving.
As for flexible pipe you want corrugated single wall drainage pipe. Here is a link of a company that makes it in white
http://www.spipipe.com/swp.htm.
Let me know if this helps or you need more info