My dream toy would have to be a mega sized plushie...a plush fox or wolf large enough to use as a bed and use the front paws/legs to cuddle as a pseudo pillow/blanket.
Hmmm... I guess maybe something older or vintage I couldn't find.
Like a Koosh Firestorm which is a vintage nerf gun that shoots rings.
Or maybe some of those older megabloks dragons sets, or old Bionicle.
But I guess if I get one. Only one. It'd be the Halo Mega Bloks Mammoth.
It's huge, my favorite Halo vehicle, the thing I wanted desperately for Christmas, and now it rings up 400$ or so online...