You'll need an optical bay SATA adapter like this: Unibody Laptop Dual Drive
Here are some quality SSD drives: http://eshop.macsales.com/shop/internal_...
Add a hard drive to your laptop by replacing the optical drive with a second hard drive. Compatible with all Unibody MacBooks and Unibody MacBook Pros (excluding MacBook Pro Retina). 9.5 mm Internal SATA Optical Bay for SATA Hard Drives. — 50+ available at 39.95 each.