I have oilcloth tissue holders which are pocket or handbag size. Ideal small gift ideas and are £3.99 with tissues included.
https://folksy.com/items/6682650-Tissue-holder-Red-Oilcloth-with-white-stars-pocket-size-tissues-included-
I’ve also got a selection of keyrings which are £3.99
https://folksy.com/items/6704885-Fabric-key-ring-pink-floral-pattern-cotton-fabric-to-wear-around-the-wrist
all perfect for secret santa.
A couple of handbag charms
I have lots of original sketches that are under £5. Presented in a handmade mini envelope with a certificate of authenticity they look like they cost a lot more!
Similarly, we reckon our DIY decorations are a fab Secret Santa gift - roughly in the right price range, and what with the massive fad for colouring in they should suit most tricky work colleagues? 
I’ve listed a few bracelets in my new shop now…
All of them under £5.00 x
A few ideas…
Perfect for all ages!!
How about a little bit of humour? I have a range of funny coasters for £3 - great secret santa gifts and an even funnier array of magnets…