More details by Prabhu:
Dealer #2 gives whatever items listed under his name AND whatever items dealer #1 can give too!
Likewise, Dealer #3 CAN give whatever dealers #1 & #2 can give.
Same as above, Dealer #4 CAN give whatever dealers #1, #2 & #3 can give.
by Orochi:
Except dealer 4 doesnt give red frags like chim frags or seal of soul frags. likewise dealer 3 doesnt give cych frags or cloak of runes frags. and there's other blue/green stuff tat u don't get from 3rd and 4th dealers, that 1st n 2nd dealers can give.
Are you sure about the Python? Been playing since S1 and not once have I seen this.
Nemean Dracon and Python are not available anymore. They got removed in one update.