Where can I get some ultra thin glossy paper? -

Like you see on food can labels, or the ads you get in the mail.

Staples, Office Max, any stationary store.

it is called everyday photo paper. Just look for a 20lb glossy stock paper.

Find an underfunded government organisation and look in their bathroom. There should be rolls of the stuff. Thin, shiny and non absorbent.

office depot or wallmart

Stationary stores and most places that specialize in papers. Such as papermills or places that target manufacturers or businesses. Good Luck