As for the first part of your question, how much it takes to trip depeends on the shrooms (that can be good or bad!). I think about half an 1/8th is a good amount to trip nicely but not too hard. If the shrooms are bluish beware.....this uaually means they are stronger. I have eaten only a cap and a stem of the blue guys and tripped my face off for hours and hours. Anyway as for prices $25-$35 is about normal. $35 might be a little high but I assume they are that expensive either because they are really good or they were hard to get. Peace, love, and ganja!