Ok here are some great items I tried most or my friends kids loved them and they worked. I had a big strong girl. Sometimes I wonder if she was meant to be a boy, we call her our incredible hulk baby. ow if you do buy shop walmart this was just my quick search most items should be at walmart or online ship site to store or go to babies r us or criaglist.org or a used childrens store I love the childrens orchard myself.
http://www.amazon.com/Walking-Wings-Learning-Walk-Assista...
http://www.amazon.com/Kolcraft-Steps-2%252din%252d1-Walke... (this we owned it turned into a walker and worked great but she out grew by age 10 months.)
http://www.amazon.com/Melissa-Doug-Deluxe-Wooden-Alligato...
http://www.amazon.com/Hasbro-Playskool-Step-Start-Walk/dp... (we had this tell age 1 1/2 yrs old (this was sissy's walker shes a little smaller but it was great for a month for my other daughter too and then for a ride on.)
http://www.amazon.com/Fisher-Price-L4511-Stride-To-Ride-L... (my friend had and her son was a big boy for sure about 24 lbs age 6 months!)
http://www.amazon.com/Little-Tikes-Push-Ride-Racer/dp/B00... (you could try this and be in front and use on carpet.)
http://www.amazon.com/Fisher-Price-Baby-Block-Walker/dp/B... (a friend used and loved)
http://www.amazon.com/Step-2-Walker-Wagon-Blocks/dp/B000Q... (heard these were good)
http://www.amazon.com/Fisher-Price-Stride-Ride-Learning/d... (a friend said was good but honestly its hard for kids I would think.)
http://www.amazon.com/Fisher-Price-C5843-Gobble-Go-Hippo/... (I wanted one of these but never could find one when I wanted one, works great with http://www.amazon.com/Fisher-Price-G8683-Alphabet-Blocks/... and other fisher price blocks, easy clean up too!)
Good luck I hope he likes what ever you get, try toy r us too they let you try stuff usually same with babies r us. Walmart if they have it in store will let you look at it sometimes try it.