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Where can I buy see trhough plastic card online?

Transparent plastic sheets? How thick do you need them?
http://a.co/0Sh2Eaw
-25 Pack- Clear Transparent Plastic Sheets for Inkjet printer, .004" Thick

They need to be thicker. Like 0,3 cm.

I use Styrene from the US brand Evergreen.
When I google Evergreen Styrene Norway, I get some webshops.

try searching for "clear acrylic sheet", not plasticard, that sounds like what you're looking for

Yeah, 3mm is pretty thick for clear plastic sheet.

Acrylic sheeting sounds closer to what you're after, especially at that thickness.

If you want 3mm see through acrylic, try your local DIY big box store (building materials/home improvement). They usually have acrylic sheets to make shed windows out of.

I was just going to suggest home improvement section look for thin plexi-glass. They may actually make it that thin.