Thank you for your reply. I have included a link below for the items we sell for your printer:
https://www.cartridgesave.co.uk/ink-cartridges/Canon/Selphy-CP780.html
All the items on the list include a colour cartridge and photo paper, the sizes/quantity of the paper for each pack is listed in a box which is displayed under the 'cost per photo box'.

Thank you for your reply. I have included a link below for the items we sell for your printer:
https://www.cartridgesave.co.uk/ink-cartridges/Canon/Selphy-CP780.html
All the items on the list include a colour cartridge and photo paper, the sizes/quantity of the paper for each pack is listed in a box which is displayed under the 'cost per photo box'.
Yes, the KC-36IP pack is compatible for your Canon Selphy CP-780 printer.

We don't regonise the product code you've provided and would only imagine that this reference would be for a non-Canon cartridge supplied to you by another retailer. Therefore, we can't confirm the compatibility of this cartridge for any printer listed on our website. We only stock genuine Canon CP780 photo packs which contain the ink cartridge and paper. As far as we're aware, separate ink cartridges aren't available for this model. Please contact Canon or the company who sold you the cartridge for further help with this enquiry.

The Canon Selphy CP780 printer only uses tri-colour ink cartridges which are sold in a combined ink and paper pack. Separate black cartridges aren't available for the Selphy CP780 printer. For further information on which cartridges you can use please refer to your Canon CP780 user guide: http://gdlp01.c-wss.com/gds/0/0300002060/02/SELPHYCP780_PUG_EN_03.pdf

Unfortunately, we don't sell printers ourselves as we specialise in the consumables for printers. HP do a good Photosmart range, Epson so a good Stylus Photo range and Canon do a good range of Selphy photo printers such as the CP780 model you'll find listed on this page. Most printers tend to do 10 x 15cm photo prints although you should investigate this with the various manufacturers and printer retailers before purchasing. We recommend that you read some online reviews of the latest budget photo printers to come up with some names and then read the specifications or contact the manufacturer to ask questions once you've found one that you feel meets your criteria.

The Canon Selphy CP780 is a photo printer. As far as I am aware this printer is too small to use with A4 paper. If you are intending on printing text documents and reports I would consider a different printer.

Unfortunately not. The largest print available is of postcard size with the KP-108IN pack which contains 148mm x 100mm photo paper. It can be found here: http://www.cartridgesave.co.uk/KP-108IN.html

Unfortunately, we are unable to deliver to addresses outside of the UK.

Unfortunately, we don't recognise the code "OYVJK411Z" so we're unable to clarify if this item is correct. However, the Canon KP-108IN photo pack is compatible with your Canon CP780 printer and includes the postcard sized paper. With the Canon Selphy machines you need to ensure that you're ordering the correct paper size that fits into the paper tray you have, as Canon provide a number of different paper sizes which are all listed under your printer model.

Unfortunately, we only supply Canon Selphy CP780 ink refills and consumables rather than printer parts. Please contact the supplier of the printer or Canon directly for further assistance with this type of enquiry.