One of the top breeders in the US is in PA. I believe they had some wins at Westminster. I would email them and ask if they have any pups or know of anybody (reputable) with puppies. Word of warning, if you have young children it's unlikely that they will sell to you.
http://www.chrismanmaltese.com/
Here are some other top breeders in the US. It can be difficult getting a female pup and they often have no pups available at all. Some may be willing to ship.
Marcris is in Florida~
http://www.marcrismaltese.com/
Divine Maltese is in Louisiana ( Larry won best of breed at Crufts 2005)~
http://www.divinemaltese.com/
Veranda Maltese is in Texas and has a male for 2000.
http://www.verandamaltese.com/v_puppies.html
Riverwalk is in Texas and breeds yorkies and malts. Bill is very nice and can help with info.
http://www.riverwalkkennels.com/rw_puppies.html
Pashes Maltese is in Texas and is where I got Bentley
http://www.pashesmaltese.com/
Rhapsody is also in Texas
http://www.rhapsodymaltese.com/
I can give you more breeder info but these are the ones I have "knowledge" off. All of the above are top line breeders. You may have to get on a waiting list and they may be very picky about future owners. Good luck