Unfortunately you can't order these leaves
from IKEA online. You have to actually go to IKEA. I suggest calling your local IKEA first and seeing if they have some (they almost always do). Otherwise, ebay occasionally has some. They cost about $15.
In addition you'll need:
1) Lilypad Arduino
2) >400 feet of 1mm fiber optic filament
3) Conductive Thread
: $33/spindle, but you could get a smaller amount for $9
4) Six Power LEDs: Anywhere from $5-$10 each. Check on ebay if you want to buy bulk. Luxeon
LEDs are nice, but the ones I used
are discontinued. Check up on your forward voltage depending on what voltage you run your lilypad (which has no current regulator). I ran mine on 3.7V and my LEDs had a forward voltage of 3.4V, so I didn't need a resistor (the lilypad can handle 40mA safely).
5) Battery / 3.7V Wall Adapter: I used these tiny li-pos
($12) with a usb charger
($10). It runs the leaf for 4-5 hours per charge. You can also by a wall adapter and use that to power your arduino (just cut the chord and attach your power and ground lines or else get a coaxial converter). If you get a 5V wall adapter
($6) add some resistors to your LEDs (like 40 Ohms. 100 Ohms to be extra safe with whatever LEDs you buy).
6) Green Fabric: Cheap at craft stores. You won't even need a square yard.
7) Velcro: Cheap at craft stores.
8) Small Clear Beads: Cheap at craft stores.
9) Hot Glue: Cheap at craft stores.
10) Sewing Needle and Scissors: Cheap at craft stores.
11) Green Gaff Tape: Cheap at craft stores.
12) Blue Painter's Tape: Cheap at stores.
13) Single Stranded Wire: Cheap
14) Electrical Tape: Cheap
15) Fine grained file or sandpaper: Cheap
16) Heat-Shrink big enough to hold ten 1mm fibers: Cheap
16) Solder and Soldering Iron: Expensive but hopefully you can access one!
Remember to check ebay/online for cheaper prices!