These
inflatable dinosaurs are brilliant for a
dinosaur party. The big T-Rex and friend make very impressive room decorations without having to spend too much money. The kids will enjoy playing with them too.
We like that they are proper identifiable species of dinosaur like T-Rex, Triceratops, Steosaurus, Parasaurolophus, Brachiosaurus and Pterodactyl or Pteranodon.
The dinosaurs are around 30" in length or height so they're a great size for younger kids to interact with.
And the Pterodactyl (or is it a Pteranodon?) is just asking to be hung from the ceiling. Note that young dinosaur experts will point out that there weren't actually any flying dinosaurs, but there were flying reptiles around at the same time as the dinosaurs.

Jumbo Inflatable Dinosaurs (6 pc)
@ Amazon
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You could play blind man's dinosaur with these too. Blindfold a child and put an inflatable dinosaur in front of them. If they can work out which species it is then they get a small prize.
The dinosaur will surely get played with by your young dinosaur fan after the party too so they make an extra birthday gift. Or you could choose to use them as very impressive party favors if you don't have enough space to keep all of them.
Our boys got inflatable dinosaurs for Christmas and they quickly became part of the family!
See
More inflatable dinosaurs.