Petco has some nice deals on aquariums right now! Select aquariums are 50% off! These would be great for fish, and also small reptiles. Check out a couple of these deals:
Aqueon Standard Glass Aquarium Tank 10 Gallon—$10.00 (Reg $19.99)
Aqueon Standard Glass Aquarium Tank 40 Gallon—$54.00 (Reg $99.99)
You can opt for in-store pick up and bypass any shipping charges otherwise, shipping is free on your purchase of $35 or more.