That eraser is really cheap. If I could find one of these here in Brazil that would be the right one. Today I was shopping some ICs and found some erasers for sale. the cheapest was abou US$120. They must sell them very slowly... It´s very expensive for a lamp, a balast and a plastic box with a switch :-)

I thought about EEProms, the problem is that I would have to buy them. I have some 2764 from older projects, scrapped from boards, etc. I'm trying to keep my project the most affordable as possible.