In our opinion the best marketplace (with the best price) to buy the Fennec is RL.Exchange. There are many websites out there where you can buy Rocket League items. This is probably the easiest method that works every time. Next, the Fennec and titanium white version of it can be bought on Third-Party websites. Buy it on Rocket League Third-Party Marketplaces
If you don’t have any of these two blueprints then you can also try to trade 5 very rare tradable blueprints for a fennec blueprint.
This will make sure you didn’t overlook any. If you have a lot of Blueprints and can’t find the Blueprint you are looking for, then click on “Use Filter” and order your Blueprints alphabetically.