Their are two main types of foam pumpkins I've worked with.
Gemmy pumpkins cost between around $13 - $22 (less during frequent sales and with coupons) and are typically sold by
Michaels craft stores. Because the foam on these pumpkins is soft and thin, they're pretty easy to cut. You can get clean lines with a straight blade like an X-Acto knife, although that will require a good amount of hand pressure. My favorite tool to use is the heated blade called the Versa-Tool. You can read more about it
in this post. You can also use a saw-tooth blade like the
Zombie Pumpkins! Pro Pumpkin Carving Tool or store bought carving saws, although the cut edges won't be as smooth as using a straight blade.
Fun-Kins range in price between around $18 - $45. They are available for purchase online at
Fun-kins.com or at stores like
Jo-Ann Fabric & Crafts / Jo-Ann Etc. and
Hobby Lobby. They're have a slightly thicker shell and are made of a harder foam. To carve these I'd probably use the
Zombie Pumpkins! Pro Pumpkin Carving Tool or the Pumpkin Masters Artificial Pumpkin Carving Kit. To cut through this type of foam it helps to have a strong saw blade with a point and fine teeth.
A Michaels Gemmy with a Versa-Tool blade is my personal go-to choice. I don't carve a ton of foam pumpkins though, so others are welcome to add their input. To do shaded designs, many folks use a Dremel tool. But that's not required for the cut-out style of pumpkin patterns offered here on Zombie Pumpkins!