Those prices sound great to me, and with proper setups I'd jump on either of them in a second. In Chicago I've seen gray smoothhounds in that price range, but where I live now they don't sell sharks so my options are online only. I've seen smoothhounds for double that price and haven't come across Japanese leopards for the most part. I've never seen a lesser spotted catshark for sale, but I've paid more for coral catsharks that were a little larger. It all depends on what's available for you in your area.