Anything else is false economy IMO, cos they'll either break pretty quickly, or are incapable of properly cutting cable outer and fray inner wires all the time. Park's just work and they are a tool for life too.
I don't think tin snips will do it, but you can buy non-bike specific cable cutters for about £8. Sorry can't remember the site, but I did buy some for my brother and they did the job just fine.
Will be back if it comes to me!