Assassins generally breed much less slowly than other snails so your's must be carrying a very rampant gene lol
Most tropical keepers entertain them to keep on top of nuisance snails such as ramshorn and pond snails. Have you considering selling them? (Far wiser than adding snail eating fish IMO)
Prices on Ebay range anywhere from ?2 for one, to ?6 for 5. If you undercut the prices listed and charge enough to cover postage and your ebay fee, you would probably do very well Personally, I wouldn't post in winter though without the use of a heat pack. Lack of available food will slow them down in time.
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