Another option is to get a different prototype shield. I've bought the following:
- http://www.robotshop.com/productinfo.aspx?pc=RB-Dfr-98&lang=en-US -- I just got this shield, I like it because it has screw terminals to connect the wires. In my other proto shield, I had the wires coming out of the headers when the shield was moved around. However, the pads on the board aren't as well laid out like a breadboard.
- http://arduino-direct.com/sunshop/index.php?l=product_detail&p=93 -- this is the shield, I've used for some time. It doesn't have a second row of pins, so you have to attach the wires to stackable headers, which if you move the shield around, they can come out. It has two leds and an extra button on the shield that you can attach to any pin.
Two others that I've thought of include (note, these aren't assembled, you would have to solder the headers to the boards):
- http://www.robotshop.com/productinfo.aspx?pc=RB-See-70&lang=en-US -- My local Radio Shack is having a clearance of these at $9.99. Note, RS also sells the Arduino branded prototype shield, which is what I think you have. The Seeed version includes some leds, buttons, and potentiometer.
- http://www.aztecmcu.com/catalog/i125.html -- I like this because it has more holes like a breadboard, where as the others, you don't have as many connected pads.