I took New Chapter Organics Perfect Prenatal. I purchased them online from Christine's Cleanse Corner. They're a bit expensive: about $55 per bottle, but the iron is pretty low. I didn't save a bottle, but I think the RDA of Iron is about 18% or so. Don't quote me on that. Check it out online. I can tell you from personal experience that this vitamin is very easy on the stomach. On the bottle it says that you can have it on an empty stomach, and it's true! I loved it. It's a whole food vitamin. One bottle lasts a little over a month, I think.
Now I've gone a cheaper route by drinking my vitamins in powdered form. I buy powdered herbs, etc. from AmeriHerb out of Ames, IA. I mix one oz. each of the following 11 powders: beet root, wheat grass, nutritional yeast, lemon peel, orange peel, spirulina, chlorella, alfalfa, spinach leaf, rosehips, and barley grass. I got the "recipe" from a nutritionist who tells me that the mixture contains everything you need. I bought some glass canning jars (quart size) for storing the leftovers, which will last over a year. They don't spoil for a very very long time, if ever. The whole shipment cost slightly over $100. Well worth it. (Ameriherb's phone # is 1-800-267-6141. They open at 8:00 AM. Call early if you want service. They tend to get very busy. Perhaps just ask them for a catalog the first time.)
One last thing: my midwife told me that if you're eating a whole foods diet, you shouldn't really need a prenatal. (I took them anyway.) She also said that you can brew alfalfa tea (or even take an alfalfa supplement....super cost-effective!) and that is perfectly fine as a prenatal. She says alfalfa has so much nutritional value that it's great as a prenatal vitamin. I ordered red raspberry leaf, nettle leaf, and alfalfa from Ameriherb and made myself a prenatal tea by steeping equal parts of it overnight and then straining the herbs out and refrigerating the rest. It makes a great iced tea! Raspberry leaf tones the uterus, nettle aids circulation (is a source of iron too) and alfalfa provides calcium, etc.
Enjoy your pregnancy!
P.S. I wanted to add that you most likely will not become iron deficient later in your pregnancy. The reason doctors end up telling women that they're becoming anemic is because of all the fluids you retain later on. I'm not great at explaining it, but you can look up the research of Dr. Michel Odent (Google "Primal Health" and his name and you should find it), or you can read two of his books: The Farmer and the Obstetrician and Birth Reborn. I loved those two books!