They sell these bookends online for £20.00 but you can make your own in 5 minutes with little more than boiling water.
Step 1: What you'll need
vinyl records - scratched or simply unwanted records are easily available for free, small 7" ones will work better for smaller books
flat bottomed heat resistant container
kettle or pot for boiling water
block of wood (optional)
Step 2: Getting steamy
Dip your record into the hot water. The vinyl should bend easily once it heats up.
Step 3: Better shape up
If the shape isn't quite right after you remove the record from the water, simply dip it back in and try again.