Dwight one of our jammers has one. Wetter than all get out and you are right about the buttons. His broke a spring and now he is using a rubber band for a spring.
What is your upper limit on bucks? I don't have anything to sell, but there's a local accordion shop that has some Weltmeisters that might suffice, but they're like $600.
However, I say what I always do, hold out for a LA Handmade.
Another route would be to get one of those First Act toy accordions from Walmart or Toys 'R Us. Surprisingly good for not much dough. I even have a booklet on playing come cajun tunes on one of those that I could send you.
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If you're going to spend that much, and can swing it, just go the whole way. Talk to Larry Miller or Jude Moreau. Larry's retired, but his grandson took over.