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Sadly you can guarantee which singles you'll get, but that uniqueness is one of the selling points of these 7-inch Vinyl bookends at Urban Outfitters.
As you can see, these are original vintage 45s, presumably the ones no-one really wants (don't expect some rare soul for example), moulded into a 'perfect bookend shape' to support your book collection.
Available online, they retail for £20.
This is actually a really easy DIY. All you need is some boiling hot water (and the records, of course).
I made myself a pair with 12″ LPs with just a few cuts and an extra bend: http://modmischief.blogspot.com/2009/05/book-ends-sdne-koob.html