Bargain hunting burners who use El Wire will want to know:
Ikea stocks several colors of El Wire in it's christmas light section.
They have @30 ft lengths with transformers to plug into the wall
($20) and shorter lengths that run off of 2 AA bateries ($2.)
These have a steady on plus flashing mode.

The selection is getting slim at the Emeryville store
where I found it today, especially for the small battery powered lengths.

A clerk I asked wasn't sure if they would restock or not.
This is quite a savings over other sources of El Wire.