Various Sellers via Eneba has $100 PlayStation Store eGift Card (Digital Delivery) for $84.85 when you use code PSN100US at checkout.

Deal Instructions:

• Click here to go to product page
• Click 'Buy Now' to add it to cart
• Apply discount code PSN100US
• Enter your zip code and state
  • Note: Sales tax will be applied based on your location
• Proceed to checkout
• Select a payment method: PayPal or Credit Card (a service fee will be applied on this step)
• Price after discount and service fee will be ~$84.85
  • Note: Price is subject to change by a few cents due to currency exchange rate volatility