As described in the specifications, there are 108 papers (sales units) inside. Or rather 6 packs of 18 photos each. Plus 3 ink cases. I use the product myself and am very satisfied.

One ink case was enough for 3 paper packs. After that, the SELPHY automatically reports that the ink needs to be replaced. If the rate remains like this, you will end up with 1 remaining ink case, as you only need 2 for the 6 packages instead of the 3 included. I guess it depends on the type and colour of the photos.

Thank you very much for the helpful answer.