I picked up R0-4L0, Jessika Pava's astromech droid off ebay for $10. I only collect astromechs if they are assigned to a pilot.
I sold off my 3.75" collection (only keeping my pilots) just to focus on the 6" figures. I'm more of a vehicle person, but I'll pick up necessary figures associated with their respected ships. I found a Han Solo to go with the Falcon yesterday at, of all places, the supermarket I used to work at of 14 years (which I quit last August).