We have two large berry patches, and the birds keep getting to my berries before the kiddos. I saw this product on Amazon that looked cool, and leverages birds' fear/dislike of shiny things (http://www.amazon.com/Repellent-Repeller-Woodpeckers-Deterrent-Scarecrows/dp/B00UNAVW1I/ref=sr_1_1?ie=UTF8&qid=1434923459&sr=8-1&keywords=bird+scare+disc) but of course was not going to spend so much money.
Instead, I used these metal stem wires (from the floral section of the craft store... about $3) and this package of pailette-style sequins ($0.99) to make my own set of bird deterrents.
You can use needle-nose pliers to shape them, but the wire was thin enough that I did these with my hands. Make sure that the sequins can twist around to really spook those berry thieves!
As you can see, once I put all 20 of my stems in the ground, they aren't really that visible (I like the natural look).
Enjoy your berries! Let me know what other ideas you have, too