As someone who builds their own shelves from solid wood great to see this. (not made to this standard though).Speaking of not enough shelves, I'm remedying that problem in my home right now, as we speak - I'm in the process of constructing two more 36" x 78" media shelves from scratch for my growing anime collection.
I seem to recall I got mine from B&Q - 5 long boards in a pack for about £20-£25. Might be off on the pricing but reasonable sure it was that ball park. Bought 2 for double that. Cut as required. Great because the depth is perfect for BD/DVD and shelf height totally customizeable.Doing the math it would cost in the region of £200 to go the DIY route using MDF so IKEA isn't really that much more expensive for me.