There are several places to work in Miami, but if you looking for true collaborative coworking space in Miami there is only a few places, all with their own unique audience, space and community:
Miami Entrepreneurship Center (MEC261) - The only non-profit center coworking center / incubator in Miami. MEC is located in the heart of Downtown right across from bayside in a quaint little 5 story building dedicated to technology companies, and entrepreneurship called the JANE building. MEC is by far the best deal in town both financially and influential, they offer free space for anyone from out-of-town to drop-in; For locals it's only $300 a year to use all there is at MEC261 which is a lot - including desk space, unrestricted use of conference rooms, access to mentors / investors, free wifi, free printing/copying, free coffee/tea and free food (fruits and doughnuts usually).
MEC261 also provides 18 affordable offices starting at $349 a month for promising startups who need privacy. Some of the most notable startups in Miami reside at MEC261 including (HakuSports.com, RentJiffy.com, NewFrontierNomads.com, WeatherPuppy.com, RaspberryPR.com, PolarisPropulsion.com, tribeofants.com, Elebev.com and others.
Lab Miami located in Wynwood Arts District (close to Midtown) is a large warehouse converted into a open space for coworking and events, called "the campus for social and tech innovation". The space is open and colorful with lots of art and buzz, ideal for creative individuals looking to be were the buzz ( a little noisy due to its open warehouse setup). Listed prices are $40 a month for a one-time drop-in (use of the space), full access prices start $200 per month and up (see their website for more details).
Great place to go and attend events.
Buro Midtown located in MIDTOWN, a space with lots of companies from startups to professionals. Space is sophisticated and tastefully designed as well as functional. Coworking space starts at $249 per month (SEAT), lots of amenities available as a-la-carte services. Great professional space in Midtown Miami for those looking for a professional office space. (see their website for more details).
In downtown Miami, StartHub cemented its place as a new, state-of-the-art coworking/innovation hub & incubator. They are backed by a global investment and consulting firm and provides extensive resources to its members to ignite rapid growth. The prices start at $250/month for coworking desk and access to all the amenities..
MAP of Coworking spaces: