I have not good idea of price. Many are kind to use and we borrow/swap get deals that do not resemble retail.
So...
The Enve aero thingy's are very nice because they are wider at the drops than the hoods. I saw this bend in the 70s and 80s but its great it returned as this allows wider leverage for sprinting (not you I know) and no interference (knocking you wrists on the top part) and keeps you aero on the hoods.