I use Walgreens brand. It has the highest folic acid I could find, comes with DHA & you get a 60 day supply for about $20.
I use the Rite Aid brand, read really good reviews on line and bought it.
I had materna I think with my first and it made me sick every time so I ended up stopping taking it. This time around I am using Jamison brand and no sickness from it. For the most part they are all the same. Folic acid I believe is the more important vitamin to get.