Be Excellent To Each Other

I have about 300 DVDs spread out in a single bookcase from Ikea. I'm having great difficulty fitting them all in now, and Ikea don't sell that bookcase any more so I can't get another one to put alongside it without it looking odd.

So I'd quite like a cheap and dedicated DVD storage unit that can hold up to 300 (or ideally, 400-500) DVDs. They can't be "slot" cases (where you slot the DVD cases into their spaces, because many of the DVDs are digipacks or just wouldn't fit.

Any recommendations?