I have spent a few hours searching directly for Tom Tom nav systems and so far have not located any that are at what you would call a profitable price. Ive also check with many of my liquidation and closeout suppliers and they havent recieved any of those systems as of yet. I asked a friend I know from sams club about the tom toms they sell and she said they were a low profit item even from thier supplier. Thier supplier is ingram micro.
Since these nav systems are still so popular it will be hard to find a true wholesaler for them however you might be able to get them from the registered official distributers of tom tom products.
Heres a list of the official distributers.
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Note: you must be a legal registered company to do any business with any of these distributers.
I hope this can help you.