Always late these days…
Some years back I got interested in multilayer engraving plastic, in addition to Amazon have gotten free scrap engraving plastic from our local sign shop, and for a couple dollars from other shops while traveling (drop in and ask if they have time for a tour (lost of interesting machines), offer to buy some scrap for hobby use to learn about new materials). What they thought was too small for them worked well for me 
). Some years ago found nearly a thousand sample tags (looked like big keytags around 50x150mm with a pre-drilled hole iirc) in several colors on eBay, from a company that was changing to a different style, for somewhere around $20. Paid for them making welding tank tags, and probably have 3/4 of them left over. They should Maslow with a jig holding them in place since they’re considerably smaller than the she’d. Mostly used 1/8 and 1/16 endmills for cutting (about 3, 1.5mm).
OT, the import plastic is safe to eat and children must like it:
“Xinxing has its own TUV test certificate to proove that our Sandwich 3 layer HDPE double color plastic sheets is absolutely health and safe for children , even children touch or eat the material .”