I've seen clay extruders mentioned alot in posts, and I probably need one, since I can't seem to roll out a smooth "snake" of fondant, they're always uneven or bumpy. My questions is this- Is there something I can used with my cookie gun to do the same thing so I don't have to buy another pricey apparatus?
I realize that what's cheap to one may be pricey to another, but you can get a decent clay gun for about $25.
But yea as the above post says as long as your cookie gun has a die for the shape you want to extrude, you can definitely use that.
By the way the best tool for smooth hand-rolled snakes is a fondant smoother 
I don't even use them for smoothing my fondant, only for rolling decorations! lol
. . . here is another thread discussing clay guns . . . maybe some info. worth reading too . . . http://forum.cakecentral.com/cake-decorating-ftopic-224741-0-days0-orderasc-.html
I saw on a video on youtube a woman (she is also a member on here) used a flat piece of cardboard and used it over the snake instead of here fingers and it made a nice smooth consistent snake. She also used what looked like a plastic dowel along side the snake to use as a guide and rolled the two side by side.
Do any of the discs on your cookie press gun have just one hole in them or maybe one with several holes you could put tape over all but one?
noooooo, I wish it did! just the shapes to make heart, diamond, wreath etc. cookies
$25 isn't bad though, the ones I saw when I did a google search were like $400! I stopped looking after that, lol I don't need nearly enough fondant snakes to justify that kinda $$$ 
I saw on a video on youtube a woman (she is also a member on here) used a flat piece of cardboard and used it over the snake instead of here fingers and it made a nice smooth consistent snake. She also used what looked like a plastic dowel along side the snake to use as a guide and rolled the two side by side.
The member you mention is tonedna. She has very good instructional videos on YouTube. You should check them out. The video where she shows how to make the fondant pearls is the one where she uses a dowel and board to roll a "snake". HTH
I found a light-duty one for $9.95 at Michaels that is just a syringe-type model where you push it through with your thumb on a depressor. It came with lots of shapes that I won't need, but it had two sizes of round, even though they're not very big--they worked for what I needed, and it was easy to use.
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