The little jars I picked up at Joanns for $1 each (with a 20% off total purchase coupon it was an even better deal!). There are possibly other sites out there that sell these, but I haven't looked at all.
I decided to make some more of them for gifts. But this time I bought the mini dehydrated marshmallows. (I've seen these in spice sections, but you can buy it in bulk at Cash&Carry (a business supply store) here in WA. Then I tried to find Andes mints pieces in red. No luck. So instead I used my left over Bob's Sweet Stripes mints and hammered them to pieces (while still in plastic). First I tested them to make sure they melted nicely in hot water (they do).
Hot Chocolate Jars Recipe
4 Tbsp Hot Chocolate Mix
2 Crushed Bob's Sweet Stripes Mints
1.5 Tbsp Mini (Dehydrated) Marshmallows
Using a funnel, put 4Tbsp Hot Chocolate mix in the jar. Tap the bottom of the jar to pack down the mix a little. Top with Bob's Sweet Stripes mints spread around evenly if needed. Lastly add approximately 1.5 Tbsp Mini Marshmallows until almost to the top (leaving just enough room to close the jar). Close the jar, tie with a string or ribbon, and add a label, if desired.
These are really quick and easy gifts that you can dress up with a ribbon, a label, a vinyl decal, or a tag, and give by itself or with a pack of cookies or all sorts of other things. They don't cost that much either, especially with bulk purchases. Of course left-over supplies are not a bad thing when it comes to this gift!