P.G.
Hi Natalie - I bought mine at Ross Dress for Less, Target, and Motherhood Maternity. And one thing I can recommend is NOT buying a lot of stuff. I think I spent about $200 for my pregnancy clothes - I got 1 pair jeans (@ Motherhood - great selection and good prices), black pants, and brown pants. Several v-neck t-shirts from Target, and a few fun clothes from Ross. The shirts can either be Maternity or stretchy and long. If you have suit jackets or sweaters to wear over the shirts for variety, that's a lifesaver. Since you're in your 6th month, becoming bored with your clothes shouldn't happen too soon. The pants are probably the most important at this point. Jeans will have an obvious stretchy waist band, but try to get pants where the stretchy waist and the pant material are close in color. I'm still since they fit ok as regular pants and my boy is 8 months old now.
I'm new to the area, and don't know what the thrift or consignment shops are like, but they might be helpful.
Also, if you're a member of a mom's group, let them know you need help. If you're not a member - find and join one - they're great support.
Good luck!