I went on someone elses advice - I think it was on this site, saying that you can go to a large craft store and purchase one (usually with a 40 - 50% off certificate). The type they recommend was the screw-top type instead of the handpump. Your hand gets sore quickly with the trigger kind. My new screw-type extruder is still in the box but I will be using it soon. Hope this helps.
My ds gave me one for Christmas. $19.95 at Hobby Lobby - - it's a Wilton and they call it a Decorative Press Set. He kept looking for a "gun" and when he finally found it, he insisted it looks like a stapler. 
I've worked with it a little bit and it works well for what I need. My only problem with it is that it doesn't hold much fondant. I can only get a rope about 10" long. HTH
I bought a Walnut Hollow clay extruder at Michael's. It has a screw mechanism and about two to three times the capacity of the trigger one. I threw my old one away because no one should put their hand through what it required! I believe there is another one out there called a Makins.... it looks identical to the Walnut Hollow extruder.
When I'm extruding fondant, I soften it up alot by kneading in Crisco before I attempt to extrude.
I bought a Walnut Hollow clay extruder at Michael's. It has a screw mechanism and about two to three times the capacity of the trigger one. I threw my old one away because no one should put their hand through what it required! I believe there is another one out there called a Makins.... it looks identical to the Walnut Hollow extruder.
When I'm extruding fondant, I soften it up alot by kneading in Crisco before I attempt to extrude.
I have this one and like it a lot. I wish it had a bigger barrel but it works nicely. Look for it in the polymar clay isle.
Go to polymer clay express (all one word and .com) and get a decent size gun. They are great and food safe. The ones at the hobby stores are not for professionals. They are too small and you have to fill them a billion times. I love the crown moulding type disks for my Extruder. http://www.polymerclayexpress.com/clay_extruder.htm
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