in rocket league, you can unlock special item crates and open them with keys. you can find out where you can get these rocket league keys fast in this practice tip.
1st option: buy rocket league keys in the game
psyonix, the developers of rocket league, distribute the coveted key ingame:
1) open rocket league and select "garage" from the main menu. click "manage inventory".
2) select the box you want to open and click the "buy buy" button.
3) you must pay the key with your steam credit. once you have used up your credit balance, you can add it via the "load credit" button
2nd possibility: exchange rocket league keys
you can not buy your keys to other players directly in steam, but exchange them for other items.
1) in the steam trading forum for rocket league, players are now playing the latest must haves for the 2016/17 season! among other objects - among other things also keys.
2) there you can either enter into offers or even offer items in exchange for a key.
3) the abbreviation [h] for "have" and [w] for "want" are customary there. so, specify what you offer and what you would like to receive. interested parties will then contact you.
4) once you have found a trading partner, use the in-game exchange window to complete the trade.
3nd fast and cost-effective way: buy rocket league keys on dpsvip.com
dpsvip.com is offering rocket league items at the cheapest price in the market. this is fast way to get the keys when you are need any some in urgently, as all the rocket league keys selling on dpsvip.com are full in stock to match customers' demand. recently, we have a reward program on buying rocket league keys:
☆ buy 50 tradable keys reward 4 overdrive crates or 5 nitro crates
☆ buy 100 tradable keys reward 10 overdrive crates or 15 nitro crates