I haven't heard of 'wax' arrowheads unless a specialty candlemaker would do them for a diggers
I would suggest telephoning some Flint repair people,,,starting with Dr Gomer.
I watch Texas arrowheads on ebay all the time. More often than not, there is one company selling cast of arrowheads. I don't know if you're wanting one cast, or to just purchase? Here is a link to their current ebay listings.
http://www.ebay.com/sch/stonehenge_museum_supply_co/m.html?_nkw=&_armrs=1&_from=&_ipg=&_trksid=p3686
Ive made some out of wax. pour a mold then use a knife for shaping, then when you get the shape of the point use a nickel for the flaking. id do it for you if you wanna send me the wax email me skeetamack79@yahoo.com