Dinosaur mad, he is

A slow March day. Maybe even summon up the energy to dust some stuff. Glance at the clock. 2.34.

Guy comes in, and up to the counter.
'You got any dinosaur stuff?'
'Yes - there are a few teeth to choose from - Spinosaurus, Carcharodontosaurus, Edmontosaurus, Triceratops... There's some eggshell, bone, coproli...'
(Interrupting) 'Any T.rex teeth? See, what it is... My boy, right, he loves dinosaurs. It's all dinosaurs at the moment. Dinosaurs, dinosaurs, dinosaurs. T. rex is his favourite. Got any T. rex teeth?'
'No, afraid not. They're really expensive - I don't see very many and I couldn't afford to buy and sell them anyway. Have a look at these, though. Carcharodontosaurus were very similar to Tyrannosaurus in size and shape - they filled the same role in Northern Africa as T. rex in North America. Quite a range of prices - got some at £32 and the biggest is this one at £330. They look a lot like T. rex teeth.'
'Hmm. What about Velociraptor claws? Got any of those?'
'No, sorry. Claws are far, far more expensive than teeth. Dinosaurs grew and shed teeth constantly, so for every one dinosaur there could be thousands of teeth over its lifetime. The last claw I had was this size and £300 I think, but I haven't got one at the moment. There are plenty teeth to choose from though. I sell a lot of these Spinosaurus ones at £5 and £16.'
'He loves T. rex. Dinosaur mad, he is. Knows all the names and everything.'
'Well what about a bit of dinosaur eggshell?'
'What are these things? Snails?'
'They're ammonites. Sort of like an octopus that lived in a spiral shell.'
'I'll take one of these. And one of those things, there.'
'That's a brachiopod.'
'And one of these, too, please. What's this?'
'An oyster.'
'Right.'
'That's £15, please. Thanks. Bye.'
'Bye.'

Glance at the clock. 2.41. Reach for the glass polish and the cloth.