Music Blocks Mozart Set [by Neurosmith]
Price: $34.98

Amazon.com

Also found at Toys R Us

Discovery Ball [by LeapFrog]
Price: $19.99

Amazon.com

Or Learning Drum by Leapfrog (same price)

Also found at Toys R Us and Walmart

Ocean Wonders Nesting Pails [by Fisher-Price]
Price: $10.99

Amazon.com

Also found at Toys R Us and Walmart

Any "Sassy" or "Kids II" Handheld Baby toy (Rattles etc.)
Price: under $10

Walmart/ Target in baby section.