Thanks leftfeild, I will definitely check those out. I was wondering what the difference was between the 501 and an 808. If I get an 808 for her, and say I get an adapter from 808 to 501 will this cause a problem. My daughter is on the go all time and I can see her not reifilling her cartridge and running out. Is it okay to temporarily change them from one to another? I have read that 808's are very nice to use.