V-Bucks are the trading currency in all the Fortnite modes, i.e., Save the World, Battle Royal, and Creative.
You must have read it online that getting Save the World mode helps you farm V-Bucks by simply logging in daily or completing quests.
Currently, Samurai Scrapper Pack (successor of retired Metal Team Leader Pack), that came out on September 8, 2020, is the only official way to get access to Fortnite’s STW mode since Fortnite has retired the Founder’s editions with patch v13.20 on June 29, 2020, as Fortnite left early access.
So, if you’re buying Samurai Scrapper Pack only to farm V-Bucks with STW mode, then don’t because you’ll only get 1000 V-Bucks and 1000 X-Ray Tickets, after completing 4 challenges that require you completing some daily quests.
Below is a breakdown of all the V-Bucks and X-Ray ticket distribution as per the challenge:
After these initial 1000 V-Bucks, you don’t get any V-Bucks later in the game.
From v9.40, Epic has replaced V-Bucks with X-Ray tickets for non-founders, as mentioned here.
Epic has also permanently slashed the in-store pricing of V-Bucks by 20%.
So, for the price of the Samurai Scrapper Pack that is $15.99, you can instantly get 2000 V-Bucks.
At the same time, Samurai Scrapper Pack will give you max 1000 V-Bucks, that also after completing four challenges.
X-Ray tickets are exclusive to the STW mode of Fortnite and can be used to buy Llamas that give you various schematics, heroes, defenders, survivors, etc.
Fortnite Save the World is an amazing game, and you will love it. So, buy it only if you want to play it. If your goal is to farm V-Bucks, then it will be a waste of money.