Growing Wheat Grass

I've been growing my own wheatgrass to feed our guinea pigs. I did a quick websearch and found a great video tutorial here: http://youtu.be/gS8Xch0G0jM . The video is put out by the people at http://sproutpeople.org/ . I, of course, am not affiliated with them.
I found the video very informative and very thorough. From what I gathered, the important thing was to sprout the seeds for 24 hours, spread them on a growing medium for more or less 5-6 days, keeping them in the dark and water every 12 hours.  After which, you give them plenty of light, and you should be able to harvest your wheat grass for 2-3 weeks before depleting the grass.
I didn't know if you needed a special sort of wheat seed, so I ordered a pound of wheatgrass seeds from sproutpeople.org. I could not afford their sprouting kits, nor their growing kits. For sprouting, I originally used a cut down 2 liter bottle, but with experimenting, I found a spaghetti jar works great for sprouting. I followed the video instructions and sprouted about 1/3 of a cup of seeds at a time.
I have a LOT of 4 inch square potting pots. I decided to be frugal and simply use what I have. For growing medium I used plain old potting soil. The same stuff I use for my bonsai, only without the other added stuff.  I've been using about 3 inches of soil in in each pot. I found that 1/3 Cup of sprouted seeds is enough for five 4 inch pots.
One pound of seeds is not a lot of seeds, but it's more than enough for several sproutings. While I was out shopping, I found the local Winco has bulk wheat seed for about 75 cents a pound. I won't mention how much the seeds cost me online, but this is a FRACTION of ordering online. I had plenty of time to experiment, so I took home a pound.
 I noticed no sprouting differences whatsoever in product.  In all fairness, it could be that the wheatgrass seed from sproutpeople.org is a better product, but for my needs, the Winco seeds were every bit as good. Keep in mind that sproutpeople.org's emphasis seems to be in providing products for wheatgrass juicing, so their product might have more vitamins and minerals. They also provide EXCELLENT growing instructions. If you can afford them, I would recommend using them exclusively.
Conclusion: I would recommend growing your own wheatgrass. My guinea pigs love having fresh grass, and growing my own wheatgrass allows me to provide a low cost, highly nutritious product. If you need an online source for growing wheatgrass but cannot find a cheap local source, try http://sproutpeople.org/