From Ireland where insurance real expensive, if I buy a car to drive coast to coast what is the best way to get insured for the month? Companies?
Buying a car for one month?
First of all, I am not sure it makes much sense to purchase a car, pay for registration and insurance and then sell it all in about a 4-week period. Are you sure the net coast for renting a car isn't less than the purchasing option?
Generally, an international visitor should be able to purchase a month policy covering third party, fire and accident damage for around $150.00. If you go the rental route -- you should expect to pay another $15 to $25 for incidental insurance coverages. I would suggest looking at the AIG.com site for more information.
Have a fun adventure!