I just did a quick run around the hotel situation for MIPTV. Some 70% of accommodation is already booked, including most of the good value hotels. But there is good news. You can still find rooms in most of the big hotels at a price (€1500-2300 for the three days).
Where you have more choice is in the apartments and studios for rent. There really is something for everyone. Depending on your expectations, you can choose from the stunning location of the Relais de la Reine right on the Croisette (over €5,000), to the popular Ancienne Laiterie (€570-660) and the Villa Francia (an amazing €180 for three nights).
The Villa Francia is just outside town with great views over the bay and an infinity pool. The rooms, however, are basic and you have pay for extras such as the car park and Internet. I’ve stayed there many times and figure the inconvenience is worth the price. Take a taxi from the Gare Routière/Town Hall. Once you check in, try and time your departures to their free shuttle bus. Taxis cost between €10-15. Walking to town takes about 30 minutes and is very pleasant if you walk along the coast.
See for yourself at MIP hotels.