Firstly congrats on your new bbs
I got one maternity bra when I was only about 10 weeks as my bbs grew really quickly. I now have a few more - i went from 12c to 14d and now also have one 14dd..... I have found the bonds one give great cleveage - which I missed in the lovable range, and bonds also make a wonderful maternity singlet - which has the inbuilt bra.... I pick these up in the after xmas sales for half price - around $25 so my guess is they are around the $50 mark.
The advice I have been given and will give is go and get fitted..... I went to bras and things and they were great. Also make sure you have some room to grow - in the cup and across the back as you will keep getting bigger YAY!!!