Hi. Did you mean a completed reborn doll, or a doll kit that you can reborn yourself? You can buy a doll kit for the money you have plus a few supplies and save up your $10/week or did you say every couple of weeks? and buy your supplies little by little until you have everything you need to reborn a doll.
For the doll kit (blank kit -unpainted head, no eyes, no hair, arms and legs) and supplies, bountifulbaby.com has some that are within your budget