Sony Store - Buy $100 eGift Card and get $20 eGift Card as bonus
Sony Store is offering $20 eGift Card with puchase of $100 eGift Card.
(or try below link)
I haven't tested whether this works with the AMEX SYNC $25 credit option or not. If that works, it's a sweet deal.
Promotion Terms & Details
For every $100 worth of Sony eGift Cards purchased, the purchaser receives a $20 Sony eGift Card.
The Sony eGift Card may not be redeemed or consolidated with other card, offers or coupons.
Sony eGift Cards can be purchased in any denomination from $25-$500.
Offer ends December 29, 2012.