i buy used equipment, and my jobsites take me to the coolest places. My most recent site was in silcon vally at waffer making facility that was bought out by a bigger company. over the days i worked there i got friendly with one of the engineers and he gave me some flawed 300mm silicon waffers. it is so cool. i had a bunch of them but they are brittle. and he gave me a bunch of waffer handling tools.