Welcome! Glad you found what your looking for. Sometimes you have to pay the price for something you love. I think passifloras are really interesting plants, and their flowers are no short of "unique" not to mention beautiful.
Here in the states stores sell them on occasion, I usually see them here in the begining of the summer, so maybe thats the best time to look for them. I myself would love growing this plant, and maybe it will be an addition for next summer (I already have white mandevilla seeds and papayas which are already spouting, as well as the 80 something plants I brought inside from the summer, some are still outside like my elephant ears, bananas, cannas, hibsicus and plumerias.)
Good luck
