Possibly targeted, please confirm in comments. I'm fairly sure it's targeted as on my eBay Summary page there's a link to the offer with a code that definitely looks unique. Probably due to my once (and only once, ever) clicking the 'Join now' link to read what was on offer for the monthly subscription, so I'm forever flagged in their database as 'possibly interested'.
Minimum purchase must be $20 with the voucher and it has a short expiry date of only a week.
T&Cs of this promotion can be seen here.