Which online poker site is best if you want to invest as little as possible

[GrannySmit77]

888poker has by far the most freerolls available on a daily basis, although I don't like the site much..but that's just personal preference

GGpoker has daily freebies where you can grow your bankroll quite easy.

Cardschat also has freerolls both at GG and 888poker

I agree with those choices. Furthermore, 888 has a structure where you advance instates just by plying and at the end of the month you get to play a freeroll. After level 80 they offer a 10k freeroll a month. GG does not offer anything close to that, but have some daily freerolls.