I bought a this
Peeramid bookrest which does a fairly decent job of holding my hardcover copy of Gombrich's
The Story of Art, good job of holding the average hardcover and a great job of holding my tablet. It's particularly useful when I'm listening while doing embroidery as the side pockets work well for holding my scissors and the rim makes for a useful pin cushion when needed.
On the minus side I've already bought a book this month and it's been several months since my TBR list has decreased instead of increased.