You should book movers at least two months before your move because many reliable companies are booked well in advance for the most competitive rates. However, Alliance Storage & Moving does offer emergency moving services.
This depends on how you define cost. While DIY-ing and hiring a rental truck might be cheaper in monetary terms, it can bring loads of additional stress. Sometimes it pays to hire professionals to handle a move from a to z. It minimizes stress and frees up time to focus on other aspects of moving.
The price is dependent on the number of belongings that require relocation, distance traveled, and any additional services like furniture disassembly and reassembly.