Hot Wheels toys are complicated to manufacture and produce, from what I had read.  Hot Wheels are classics. 
Yeah I bought him a hot wheels monster truck and it is metal with real rubber wheels
You can buy Monster Trucks in two-packs.
I like the large ones that come as singles
The balsa wood flyer (aeroplane) is a classic as well for boys.  
That takes me back. I used to love playing with wooden planes as a kid. I remember the foam planes with propellers that used too glide.
You can buy the T6 Texan Rubber-Powered Aircraft (30 Wingspan) online
Thanks I'll check it out. It sounds expensive though? My son likes to break his toys!!
The Erector Set was a classic that you cannot find anymore
I like toys that I can help my son build. They give more satisfaction than simple things to play with and actually teach him something. 
Classic tin toys were awesome as well.  The cars looked so cool!