About $200+ considering you get the different tube sizes as well.
So you're telling me to buy a Poldiac AND a Nemesis. Okay...what are the going rates for these?
You can figure an somewhat "available" high end mech(vs Carvela/ Chi You) will be competitively priced.
If its a tube with one single tube size its a bit less.
Today we have pretty much reached a plateau (a good one)... a level of quality amongst the high enders.
Here are the factors:
Contact materials
Adjustable top positive connector pin (to the atomizer).
Batt contact - adjustability for different length batts within same size group (not all 18650's are equal in length).
Firing design ("button" or "switch"); check out the various ones. its important.
Today there's like one or two mech tubes made of Titanium which jumps the price.
Unless you can afford to try a few, or all, research these factors well before you pull the trigger.