[mtu9001]

You can order them.

https://shop.lego.com/en-US/Pick-a-Brick

Order all of them.

[throwanem]

Bricklink has a much wider selection and better prices.

https://www.bricklink.com/catalogTree.asp?itemType=P

[pavel_lishin]

It seems wild to me that there's someone with a single black 2x4 brick in their inventory: https://store.bricklink.com/Teo.92&itemID=119350903#/shop?o=...

[throwanem]

Testing, maybe? I might do likewise to get a sense of the UI, markup, sales flow, et cetera, before sinking a bunch of time listing everything.

[pavel_lishin]

Maybe, but they've got 213 other items for sale.

[throwanem]

Oh - didn't see that.

If I'd decided to sell out of my collection instead of giving it away, I'd have had some parallel cases - any large enough collection is liable to include a small but significant proportion of one-off parts. I'm not sure a 2x4 black brick is likely enough to sell that it'd be worth listing alone, but I suppose someone with a sufficiently completist bent might go to the trouble.

[pavel_lishin]

I wonder if they bought some sets, and are selling based off known contents - since they're technically pre-sorted.