Peaceful Valley Farms in CA...they have a website I'm pretty sure. They will definitely have what you are looking for.

I purchased mine from Peaceful Vally several years ago but I didn't find it helpful in our area.

Orangeburg Wal-Mart carried this mulch in a package of 8 each 3 feet by three feet pieces for approximately $7.75, marked down at the end of the season to $6.

Yeah, I was JUST going to say I saw it at Walmart.

Dollar store has red plastic table cloths- I used them!

I just got both the mulch and the red water walls from Pinetree Garden Seeds. They sell the mulch by the foot--which was nice for me as it is an experiment this year and I didn't want to spend a lot of money--.19 per foot, with a low minimum footage (10 feet if I remember correctly).

One warning though---I looked in their catalog for a few certain seeds and the mulch, and ended up spending over $100 by the time I was done browsing! The up side is that everything was shipped immediately and I am very happy with what I received.

Here is a link to the specific page on their website for the mulch:

Here is a link that might be useful: Pinetree garden seeds weather supplies

http://lubbock.tamu.edu/horticulture/documents/EffectsofPlasticMulchTypeonTomatoGrowthandYield_2004_.pdf

In other words, spend your $8 elsewhere...