Hello @Jinjonator,
We have informed this change in the following forum topic:
Removal of Support for PayPal - Gameflip - News & Updates - Gameflip Forum
Now regarding the cupons, unfortunately we do not have any available, but please stay tuned for future cupons.
Also, we have a current promotion ongoing 
Check it out in the following link: https://gameflip.com/promotions
God Speed! 