I had an Iomega Zip drive, too! So cool, but the higher capacities were too expensive and the parallel adapter didn't work everywhere. I forget if there were compatible discs, not made by Iomega, that were cheaper?
Right after I graduated, they found the budget to upgrade to blueberry iMacs. The superintendent/principal was also the only person I ever saw using a G4 Cube in the wild; that Apple salesperson must have done a hell of a job. One of the office secretaries had one of the education-market-only beige all-in-one Power Mac G3s too.
I believe sometime in the mid-2000s, they moved on to a contract with Dell like everybody else. I guess the iPad era has seen Apple regain some education market share, but they used to absolutely dominate schools.
When they were originally released, I believe the first model was SCSI-only and cost $199. Disks were $20 each and held 100MB. Eventually the price of disks dropped a bit, until they were around $11 or so in multipacks the last time I bought any.
They also had backwards compatible 250 and 750 MB drives, but I don't know how well they ever sold. I never saw either in person. I think by the time they hit the market CD-R drives and media had dropped in price so much that Zip disks weren't economical as either a backup or file-transfer media.