I posted about the fruit notepads last year plates - if you do a general search on ebay (and probably on amazon and aliexpress too!) for fruit notepad there are loads. They're notepads rather than post it notes though - and if you want a really full apple notepad then it might be worth getting two to get the same effect as the ones in the picture.
This link has lots in price order (although it's worth scrolling through if you're buying several as some people offer 3 for the price of 2 which means they become relatively cheaper per pad but ebay price sorting doesn't pick it up.
www.ebay.co.uk/sch/i.html?_from=R40&_sacat=0&LH_BIN=1&_nkw=fruit+notepad&_sop=15
A typical apple costs 99p - this supplier had lots of other fruit too
There are loads of other things too including christmas trees which are cute and festive.
If you go through ebay.com rather than ebay.co.uk there are a few sellers that sell these from about 88 cents including free postage which makes them even cheaper, although there doesn't seem to be such a big selection particularly at the cheapest end.
However if she likes cute stationery - they do have loads of cute stuff at about the $1 mark including postage when similar stuff comes up at 99p over here so about 60-70p depending on the exchange rate (and even at a bad exchange rate it's still cheaper than here!) - these cute post it notes are great (including things that are 88 cents that would make nice presents for friends if they too like cute stationery) but search for other things on there too for all sorts of different things.
The korean (or japanese?) name for their cute stationery seems to be kawaii - if you do a search for kawaii stationery on ebay.com loads of different cute stuff comes up - note pads, pens, rulers, lip glosses, phone charms, rubbers, washi tape, purses, clips, things for winding up earphone or charger wires, stickers and so much more, all for around $1-2 each.