Smp1 - Stocking a New Shop

Hey guys! I have only recently started playing again, and my lazy brother Crazy1080 finally got off his butt and finished the rest of the shop, but there's one problem.

What are we gonna stock?

We want to stock items that are in demand constantly for a cheaper price. We have 60 double chests (Against four separate walls) and 6 single chests. We don't really want to stock cobblestone/stone/dirt/other building blocks that are in total abundance. Well, sand is wanted quite a bit but anyways, we need you guys to help us help you.

So post 1 thing you want us to have or all 66. We CAN add more chests if needed, but we don't want to be a mega or super store. Large stores are nice, but difficult to maintain and hard to keep in stock. The odder the item the better.
Double:
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Single:
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When we know what we want, we'll spend a couple weeks stocking them and then we'll be officially ready to open! We appreciate the help! If you wanna view the store it's on residence 404 in Smp1.

You surely have to stock diamonds,iron,gold and slimeballs.

I can stock a dc of smooth sandstone.

A safe shop setup would be no less than 48 stacks of everything. I have seen this work in countless setups and never fails.

A metric ton of each? Very well. Time to get to work! Would you message me your outpost in smp9? If you'll allow me to use your oh so sexy iron farm