on the photocell side of things, I'm using what I had, a 10k 1/4 5% resistor.
If you haven't already made the purchases, take a look around for better pricing
Places I buy from are
Depending on how soon you want things.. mouser is pretty cheap and quick on delivery.
Breadboards you can get sets of boards for same price as one on ebay
Digikey is pretty close to mouser on prices, shipping little more
Adafruit I get when I cant find the items at any of the other places..
Check out mouser for the parts/components before you order, may save you some money..
the uno, unless you are stuck on getting Arduino brand board, you can get comparable board from here for $5.99
Everytime I go to this store (local to us here) I pick up a few boards just to have, even the mega is cheap $9.99