I would go with a little cheaper, You want people to buy loaches off YOU, Not the LFSI would say around 45-50 dollars for 6'' and 25-30 for 4''. Good luck
4" sizes @ $20-$25 each is realistic from a private seller
6" size @ $50- $60 (It really depends if it is sold on MFK or Craigslist,)
In my opinion, this would be a good start.
WHAT? I just got 8 4"+ clown loaches for $4.50 each at my local petsmart that's crazy over priced
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