I found some pretty good deals lately. Everything in the this picture cost about $5 total. I found the Hot Wheels R2-D2 and the Batman Unlimited Mighty Mini at the local dollar store, and the Darth Vader and Boba Fett Funko Pop Pens were on clearance at Target for $1.48 each. I cut the pens off the figures so I could display them.
The dollar store had the last series of Batman Unlimited Mighty Minis (also including Nightwing, Red Robin, Polar Batman, Clayface, and Killer Croc) as well as the Star Wars 40th Anniversary Hot Wheels Character car set.