I am in need of Custom Plastic Cases, does anyone know a good place to get them?

Hi there. I am looking for a supplier of Plastic Cases, one that most likely builds the cases themselves. The specific dimensions are below. I have received quotes from local Plastic Shops here in Los Angeles and are getting prices in the range of $100—$150 per case which is too high for me. I have received a quote on the same case from a company in China and they want a mere $18 per case. However, shipping for anything between 1–100 cases is a flat $300 (Doesn’t matter if you buy 1 or 100). – Also, I rather not go to China for this.

I am looking to use these for myself but also resell them. I don’t expect to find the same prices in America as they offer in China, BUT, I would like to get these cases for around $25 per case.

Anyway have an experience with this or know any suppliers?

I’m also interested in information in regards to whether or not there are different “kinds” of suppliers.

The case I’m trying to make:

13 inches wide.
13 inches tall.
2.25 inches deep.
3 shelves evenly spaced on the inside. (created for spaces for which to put something.
A front door that is either attached with hinges or slides in and out.

Here is a picture of a hinged version I made myself for $16 in supplies. (Making larger quantities myself is not an option right now):

http://img.skitch.com/20120111-efmf226qysif82njxr8q7rfsrq.jpg