I have this adorable dino puzzle from Melissa and Doug! Today, I found it available on Amazon for $9.99.
I also have this number sequencing puzzle from Lakeshore.
I also found a lot of good stuff at the Target Dollar Spot during the summer like these flashcards and this activity mat.
Also, one of my assistants found us some awesome plastic dinosaurs which we use when making "fossils." My kids enjoy playing with these as well in their down time!