You can get credits through item packs, buying it outright, or by leveling up your Rocket pass. If you do manage to get the Fennec, you will be able to buy it from the shop with credits. There might be a tiny chance you might just get a Fennec in this shop. There is no particular order of items, meaning that you will have to rely mostly on luck. When the timer gets to zero, the item will automatically change. The items in this shop are rotated from time to time, and this rotation depends on a timer. Rocket League has a really interesting in-game shop.
You can buy unpainted cars and save money, which you can use to redesign them. Cars that are not painted yet tend to cost way lesser than their painted counterparts. You can look up cheap versions of the Fennec online. Additionally, you can also sell these items on other third-party websites. You can use the game’s unique trading system to trade cosmetics and items. Trading is one of the best and easiest ways you can get the Fennec in Rocket League.