UK £100 gift card offer

Hi all,

I've been saving Swagbucks to get the £100 PayPal gift card which has been at 10,000 SB "on offer" every time I've looked over the last 6 months, however now I've finally got over 10,000 I've come to cash out and it's now 13,030

Does anybody know how often the gift cards go on offer ?

Thanks :)