Here are a few examples of wax tablets—one Greek and two Roman. The first two (the Roman examples) come from
Roman writing tablets, 1st – 2nd century AD (Public Domain)
Newly Discovered Ancient Roman Writing Tablets Provide Snapshots of Roman-Era London
The last example is Greek:
1400-1200 from Knossos, Mycenae, Greece, from the Musée archéologique de Mycènes. Found at altmarius, http://altmarius.ning.com/profiles/blogs/antiquite-entre-culture-orale-et-culture-ecrite-des-frontieres-mo. Creative Commons License.