As I write this, we have just bought Sphero, an already built "ball" robot that focuses on coding through free apps as our newest circulated STEM toy. We already have two successful STEM kits that circulate for 2 weeks and are holdable by patrons with a valid Duxbury library card: littleBits and Makey Makeys. They are placed in a highly traffic area of the children's room (new chapter books) that is easily seen from the desk. All the items fit in Tupperware bins with lots of labels: price for replacement parts inside the box cover and choking hazard warning outside the box (if necessary) with checkout reminders. Adult circulation has many hobby "kits" called toolboxes like ukulele and bird watching already. We mimicked the labeling and call number structure structure they have established but our checkouts are shorter. They can also be searched as "toolboxes" through our digital catalog with MARC records.
When composing the kit, we take the time to set out every item and take a photo of all of the contents. This helps both tech services in setting up the kit and circulation upon each check in. To promote video game design, I added a "Learn to Program with Scratch" book ($34.95) for extension activities in addition to the purchased Makey Makey kit ($50). For the littleBits toolbox, I decided upon the smallest kit we had which included 10 bits ($89) and purchased Lego adapters ($10) as an extension activity. Kids can use their Legos from home to build their inventions. I'm not worried about broken bits since I can purchase them separately through the site. So far only the vibrating motor has broken and I just took another vibrating motor from an extra kit we had without charging the patron. I haven't given up on the vibrating motor yet either, it may just need to be soldered together.
It is important to market these items. If they are sitting in a corner, not too many people are willing to open boxes to see what is inside. At the beginning of the school year, I emailed teachers, school librarian and local troops of scouts to let them know that these are available. I also set up displays like the Makey Makey Floor Piano with the thought being it would encourage students to make their own at home. The toolbox was nestled beside the display and went out the same day the piano was constructed with a few inquiries to place holds. The Makey Makey kit has circulated 13 times since February and the littleBits has circulated 10 times.
Other possible kits on the horizon: