The Energon Pub

Also, if it helps, here is a list of all the most recent dinosaur Transformers to have been released, as recent stuff is going to typically be the easiest/cheapest to find. As a baseline, Leaders will typically be in the $50-54 range, Voyagers at $30-33, Deluxes at $20-24, and Cores at $10-12, if you're looking for as close to retail pricing as you can get (I know Amazon has a number of these figures on sale at the moment in addition, but I'm only going to call out one in particular here due to it's nature):
-Kingdom Leader Class Megatron (T-rex)
-Kingdom Voyager Class Dinobot (Velociraptor)
-Kingdom Deluxe Paleotrex (T-rex skeleton)
-Kingdom Deluxe Ractonite (Styracosaurus skeleton)
-If you count pterosaurs as dinos, then Kingdom Deluxe Wingfinger (Pteranodon skeleton)
-Kingdom Core Vertebreak (Dracorex skeleton)
-Kingdom Core Dracodon (radioactive green repaint of above figure)
-Cyberverse Deluxe Slug (robotic Triceratops)
-Studio Series Leader 86 Grimlock & Wheelie (robotic T-rex)
-Studio Series Leader 86 Slug & Daniel (robotic Triceratops, different design & bigger compared to the Cyberverse Slug)
-Studio Series Leader 86 Sludge (robotic Brontosaurus, may still be available on retail shelves in your area)
Store exclusives (may be harder to find or more expensive on a case-by-case basis):
-If, again, you count pterosaurs, Buzzworthy Bumblebee Legacy Deluxe Terrorsaur (Pteranodon, Target exclusive that is still readily available)
-Buzzworthy Bumblebee Legacy Voyager Dinobot (repaint w/ new head of Kingdom Dinobot as alternate color scheme option, Target exclusive that is still readily available)
-Kingdom Leader T-Wrecks (good guy repaint of Kingdom Megatron, former Target exclusive)
-Kingdom Battle Across Time Grimlock & Mirage (2-pack of a repaint w/ new head of Kingdom Dinobot as a separate character + a second figure that turns into an F1 car, Amazon exclusive that is still in-stock)
-Legacy Wreck N' Rule Impactor & Spindle (2-pack of a retool of Kingdom Paleotrex to be a Spinosaurus skeleton + a second figure that turns into a tank, Amazon exclusive that is still in-stock)
-Jurassic Park Collaborative JP93 & Tyrannocon Rex (2-pack of a repaint w/ new head of Kingdom Megatron deco-d to be the Jurassic Park T-rex in alt mode + a second figure that turns into one of the Jurassic Park tour cars, available at multiple retailers for a high price due to licensing but currently on a notable sale on Amazon)