I want to purchase many Chroma case keys (about 20) in the Steam store.
But can only purchase the case keys one by one from the market as I do not have the game installed.
Steam – How to buy multiple case keys at once from the market
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Related Solutions
Since a recent update, you can select multiple games by holding down control and clicking them. Or, if they are adjacent in the list, select the first, hold shift and then select the last.
Then right click the selection, which will allow you to install them all at once:
While this may not be the only way, this is a way that works:
Go to this site, and scoll down until you see the "Contact us" box on the right hand side of the webpage. Right above it will be another, smaller box with "Supply Crate Keys" on it. Click the link, and you should be able to buy a key (Tested myself)
As to why the wiki site link didn't work, I would guess that the sites link is broken, possibly linking to a old store page
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Best Answer
As @Asunez stated, you can purchase keys from the in-game menu and changing the quantity in the box next to the buy button.
On top of that, it's cheaper to purchase your keys through the game store as opposed to the market as the keys are more expensive ($2.69 USD^) than their worth ($2.49 USD).
Anyway, here goes:
Since a Chroma Case Key is a commodity, you can buy multiple items by selecting the big Buy... button, and changing the quantity you would like to buy, as indicated by the big red circle I have drawn with a touch-screen laptop.
^ Disclaimer: Market prices are expected to fluctuate and this statement may be false at some periods of time. This information is correct at the time of writing.