I did not know the mini and the blem were the same price. I just got a regular with an extension cap, since I have a Lavatube v2 and already had 18650s.
The regular sized Provari and the Mini are the same base price of $160. Same inner electronics, the Mini just has a shorter body and therefore uses a smaller battery. Both have different milling designs of the body to distinguish one from the other.
You pay more for an LED display color other than the default red, or a body color other than the default silver. Those options cost Provape more to produce, so the additional cost is passed on to those customers that want those options.
There are extension caps that fit both the Mini and regular size should you wish to jump up a battery size with either model.
The blemished models in both the Mini and regular model are reduced to the same price. You'll pay additional should they have a colored body or colored LED, just as you would with an unblemished model.
The version 2.0 Provari's in both sizes are being offered at a reduced price to clear inventory stock. The only difference between 2.0 and 2.5 are purely cosmetic in that the milled designs are different.