I believe it only comes in a powder form, but here's a good trick.
Add 1 c. Almond Milk (for a bit of a 'creamy' texture, without the calories of dairy)
1/2c frozen strawberries
1/4c frozen banana's ..
and then your scoop of powder.
Blend in a mixer (I use a single shot Magic Bullet) with 2 ice cubes and a smidgen of Splenda.
And I promise you, you'll LOVE it!
I'm not crazy about the nutrient breakdown of GNC labeled products. I'd personally stay away from them.
I find that store in general, to be ridiculously overpriced, and the brands they generally carry aren't very good ...
I believe Costco, and Walmart would carry the Greens+ product line .. maybe even your pharmacy would.
I'm not that familiar with the stores in the US, as I'm in Canada.
Right now, I'm using the Genuine Health line of products (same as the Greens+) -- I don't particularly enjoy the taste/texture of this protein, but it has a really good amount of everything I need -- It's called Proteins+
Here's the company website:
http://www.genuinehealth.com/
I'm sure you could email them, and get a list of stores that carry it near you.
As another option, I would highly recommend this line of protein powder.
It's the best, IMHO.
http://www.trueprotein.com/
It really does depend on what you're looking for.
But I hope this helps!