Just because it's that time of the year, and just because I can - in case you are still looking for some inspiration for your shopping:
The British Library would like to aid you with their list of things you can buy. (Nice stuff, though the quill they offer as part of the writing set triggers one of my pet peeves. The first thing you do before writing with a modified feather? Take off that annoying fluffy stuff. Writing quills are not supposed to look like feathers! They look like naked central ridges of feathers, maybe with a little rest of the vane at the very top. The rest of the vane? Gone. Look at any picture of medieval scribes. Or later scribes using quills.)
Or maybe you are looking for a different kind of gift? Something that will not accumulate dust? You could sponsor something like the research project for bat-friendly roofing membranes (will run for 6 more days), or the archaeological excavations at Sandby Borg in Sweden, or help the UCL museum to protect and conserve its collection of very special skeletons.
(h/t to ossamenta for these last three!)