The kits are quite expensive, but they do have entire classroom kits that the schools can purchase if there is an interest in them.

Personally, I think the VEX GO (gr 3-5) and VEX IQ (gr 6+) would be the two best options to kickstart that STEM bug. Students statistically start "hating" STEM subjects by grade 4 so it's best to find a way to build that love for STEM early and these kits do just that. The STEM lab are great for the teachers because they're designed to be done in any order. The labs are also designed to only take 40 minutes to complete so a teacher doesn't have to worry about going over time and conform to several education standards.

There is also VEX VR which allows the student to code a bot and then run the program right in their browser! No kit required. Great for testing code before applying it to a bot if kits are limited. You could have 1-2 robots the kids take turns uploading their code to.

Something I forgot to mention in the post is that there is also a grant program to help fund student travel and accommodations while attending Vex tournaments around the region, nation and WORLD!