Where are you located? Doesn't say anywhere.
In Phoenix there are literally hundreds of options, it depends on what facilities you need. Regus is one of the larger businesses, they are typically in nicer places which is good for meeting clients. Also depends on what business your in, if you need inventory, then they are typically not good places. Most of Regus is rent an office for a day type scenarios..
You would be surprised what you can get for $700 in phx, all inclusive spaces and month to month contracts.