I bought these balls to replace Melissa and Doug's toy and they fit perfectly. Maybe not the same color but it works and I will keep buying them.
Bedwina Knobby Assorted Sensory Colors
9 Review
Engage Your Baby'S Senses With The Bright Starts Oball Classic Easy-Grasp Toy - Blue/Green, Ideal For Newborn +
20 Review
Enhance Your Baby'S Gross Motor Skills With 4 Vibrant, Textured 4" Edushape Sensory Balls For Babies Aged 6 Months And Up - Trendy Colors Pack Perfect For Optimal Developmental Playtime
21 Review
Spikeball Playing Kit with Drawstring Ball
9 Review
Revolutionize Playtime with π Click Play Phthalate Crush Plastic
9 Review
π Innovative Indoor Outdoor Playhouse for Toddlers: Tunnel Fun!
9 Review
Dynamic Movement Sensory Sox For Kids 6-9 Years - Updated Version, Medium, 47''LX27''W Green By Sanho
22 Review
GOGOSO Pink Balls For Ball Pit - Pack Of 100 Ball Pits Ball Pink, BPA Free Plastic Ball Toys Crush Proof Ocean Balls Phthalate Free For Girls Toddlers Indoor Outdoor - Pearl Pink Colors
10 Review