Yikes... don't need that.
Wow, you have 25 bettas?! that's amazing.
I've considered keeping a female from my bettas' spawn and then turn her brothers and sisters over to a fish store once they're old enough to leave home. I think that'll be the hardest thing for me apart from possibly loosing a few along the way.
You can always try asking if a fish store would find homes for your betta fry. They'll usually give a store credit in exchange.