The plastic jars I found on clearance at my local Michaels but I linked a similar one below. The labels I designed in Photoshop to match the "Do You Wanna Build a Snowman" sign from the party and ordered from an online printer (try a place like Vistaprint or Printswell). The white play dough I found online here and it was perfect because they came pre-portioned in individual bags that just so happened to fit perfectly in the jars. I actually had no idea when I ordered it that it would work out that way but it was great that it did. If you're in a time crunch, I linked a regular bulk play dough bucket below with 2 day shipping, that you would just have to roll out into the right size on your own.
My favorite part was the the super cute snowman accessories that I found on Amazon. I couldn't believe they had them, it was so perfect. Instead of including a top hat, we included 3 arms so one could be used a Olaf's hair and it sort of held him together too. The googly eyes you can find at any craft store or on Amazon as well. You could also use the buttons that come with the kit but we wanted it to be as close to Olaf as possible. I love how these turn out and please comment below if you have any questions!