It really depends on the replica. Kermit I suppose will be cheapest as he is literally just the antron fleece and a few bits of felt/eyes mouth plate. When i did Fozzie the materials all in (considering I'm in the UK so was stung on importing it) cost about £60-£70 tops. Alternatively, Elmo was around £50, Floyd around £50-60 and the new Animal has cost around £80. The one rule i would say is Antron or Fur only is cheapest, anything with Ostrich feathers, lots of accessories or clothing is going to be more.