As per Vooks website, 10% of eShop cards. Will copy their info here as well.
EB haven't done their percentage off in ages and has previously been 15%, but I guess everything is selling too well to discount.
But still better than nothing, and ok to combine with the current voucher on the eShop for 2 games for $135. Definitely will include Pokemon Sword/Shield and Mario Maker 2 (no word yet on Animal Crossing)
Also if someone can confirm whether wish gift cards will allow us to buy Nintendo cards or not that would be great.
From June 20th (when the sale starts according to the video), Big W will have $15, $30 and $60 cards for the 10% off for the entire month.
All denominations of cards are up for grabs at the reduced rate;
$60 eShop card becomes $54
$30 eShop card becomes $27
$15 eShop card becomes $13.50
While $6 off a game isn’t a tonne, your best bet is to stock up on these and use them in conjunction with other sales for double the dose of discounts especially with an E3 sale coming up.