Under 'My eBay Plus' go to 'edit membership' and cancel. Follow the prompts and you should get a $30 Gift Card
Your might vary. Mine is due in July so might depend when yours is due.
deal posted last year for further details
edit. is a $30 Ebay Gift Card ( not $30 voucher )
edit. Last year ebay sent me a gift card via email after the membership renewal payment went through