There are numerous possible combinations of bullets, powder, and primer brands that could be used.
Cost vary dependant on all those variables and addition options such as casting your own bullets.
Cost will also vary dependant on the quantity of product an individual buys and whom he buys it from.
That said the 500 can be loaded from about 20 cents to several dollars per round.
Start with a reloading manual and use those combinations recommended.
Good luck and practice safe reloading- start low and work your way up.

PS. Titegroup is a very poor choice for beginer reloaders and magnum rounds in general.