Newegg has Gigabyte Radeon HD 6450 1GB DDR3 PCI Express Low Profile Video Card for $45 - $25 rebate = $20 with free shipping
You have two choices:
Option One:
A low profile card with a core clock of 625MHz and a memory clock of 1600MHz. This card does have a fan, but comes with a $39.99 software download coupon from AMD.
http://www.newegg.com/Product/Product.a ... 6814125378
Option Two:
A low profile passive cooled card with a 625MHz core clock and 1333MHz memory clock. This card is totally silent.
http://www.newegg.com/Product/Product.a ... 6814125404