They have them at Wal-Mart here in MI, but night fishing isn't at all uncommon either. However the only ones I've found there are the red ones.
They are very small, about an inch long and weigh next to nothing. The only time I noticed any difference in flight characteristics was when I taped one to the nose of my havoc and that made forward flight faster. On the AA's they fit in the undercambered wing area and don't produce any noticable extra drag either.
Here is an article showing them:
http://outdoors-magazine.com/s_artic...id_article=209

Here they are on Cabella's website:
http://www.cabelas.com/cabelas/en/te...0011798115124a