[quote name='ZerotypeX']Where did you get the first, third, and fourth shelves from and how much were they? They look really nice and I am planning on getting new shelves[/QUOTE]
They're
these from Best Buy for about $74 each. (Got them for ~$36 when I was an employee.) Supposedly they hold 360 DVDs. (I don't care to actually count, lest I start cataloging and organizing my media.) I think I saw someone else in this thread with the same shelves. The last one I got actually has the shelf holes drilled differently, so the shelves mount at different levels. It all assembles with a screwdriver and hammer. No annoying allan wrenches for this one.
The older ones (1st and 3rd shelf) wind up with 5 rows perfectly sized for DVDs, and two other rows of odd heights, one of which is the perfect size for HD DVD/Blu-Ray/PSP cases, the other a bit taller than CD/NDS. The later model (4th shelf) can do 6 rows of DVD, and a row for CD/NDS. As you can see on #4, you can create a little nook with some of the extra space on the top half for miscellaneous items. The older model can still do 6 rows of DVD, but--looking from the bottom up--the third row doesn't have a set of holes above the height of the cases to make an extra row. I suppose you could just sit a plank on top of the cases, but depending on how tightly you pack things in, it might become impossible to get out your discs without room to insert your fingers.
How to differentiate them? For what it's worth, the new one seems to be a brighter kind of wood. Unfortunately, I can't describe it better. The boxes seemed exactly the same as far as I can remember. I mixed and matched my shelves, and the thickness and color is noticable if you really pay attention. Unless you're using it for all small height items like CDs, there were plenty of shelves left over, and I've got a stack of leftovers in my other room. Unfortunately I'm too lazy to do the division to count how many each came with.
EDIT: Felt like saying something about the 2nd shelf pictured. That was a $20, free after rebate, clearance unit from FYE from a couple years ago. It's ludicrously light and feels like it will break in a gentle breeze. When I was first assembling it, I thought they sold me a box of balsa wood. It also seems to have been poorly drilled in that the thing wound up crooked despite everything being premeasured and drilled. No wonder they were getting rid of them. At Thankfully, I did, indeed, get my rebate. At my previous apartment, it was totally filled up and held together fine, but I'm sure that due to its poor design and manufacture, it would tumble over were it not for the wall behind it.