From the one supplier I deal with they are looking into the 100gpd membranes but for now I could give you pricing on 50 and 75 gpd membranes.... they are Duro brand
TFC 50gpd membrane= $70.00+tax+shipping from Kelowna
TFC 75gpd membrane= $75.00+tax+shipping from Kelowna

Let me know if that is a fair price
Anyone who is interested let me know...