hi aimee- if you can find yourself a temporary space or short term, Office Nomads is hopefully going to be ready for occupants in the next few months.
The rate for 1-2 days a week will be $100. so def. under $400!
And, there will be so much more to this space than just office usage...resource library, meeting rooms, a small exercise area - good for stretching out and idea pondering, kitchen...and hopefully will double as an art gallery for artwalk evenings!
go to www.officenomads.com for more info and to chime in on discussions, etc.
also visit my thread in the Q&A section on biztalk where I am asking what is important for people in terms of the feel of their office spaces. i am taking notes that i can implement when it comes to doing the decor for the space!
good luck to you! hope to see you at nomads!