I don’t have a RAZR phone but this charger is a standard mini-USB format which works with many other phones (i.e. my t-Mobile Wing and my wife’s KRZR).
You can get one right now from CellularFactory for $0.99 plus $3.99 shipping. The regular price is $7.99 but 7OFF code brings it down to $0.99
The description claims this is the original Motorola car charger which means the quality should be OK.
Here is a BBB record for that company. Granted, not all rosy, but hey, this is just 5 bucks! Might well cancel the transaction with the credit card agency if there are issues.
Just got my charger in mail. Works like a charm. ;-)