I use a £5 Tesco value one and it works a treat, the holes don’t matter, just don’t put any water in it. Simples!
EDIT: PS don’t try to iron your clothes with it afterwards as it has a habit of dripping molten wax onto your best shirts! Our regular iron broke and thought the one I had used for waxing would be fine as I couldn’t see any wax on it, oh how wrong I was!! 🙂