Visit the Team Iceshanty Proshop
Here's a link to this type of light: http://www.ebay.com/itm/LED-Deep-Drop-Underwater-Diamond-Fishing-Flashing-Light-Bait-Lure-Squid-Strobe-e-/121367817810?pt=LH_DefaultDomain_0&var=&hash=item1c4215ee52I can't say for sure that this is the same place I got mine from but these are $1.92 with free shipping. Looks like they are advertised as "deep drop" underwater lights used to attract squid.