So I'm off for a week to see my cousin and one thing that we both like is airsoft. So I recently got my E90 and luckily my brother had an old P90 sight that fit mine, not the best scope but I thought, eh, it's better than the iron sight. The only thing I needed to do was get new batteries for it. And of course, I go off to wal mart to pick some up and grab a soda for the way back. First I go to electronics and they tell me go to the photography spot and they say go to the jewelry spot, best part, each battery was $5. So having to get two I paid ten to keep the sight that was probably only worth ten dollars, I still can't believe that a 389 battery is that much, but that's life. Giving me yet another reason to get my own halo sight for it.