Stats for Proposal/Marketing

Does anyone know where I can find out how many copies a book has sold? I tried to do a search with the title of the book and the words "has sold" and "sold" and "copies" but no luck. The book was published by the author and there is no contact information for what is listed as "the publisher." I do know that it has sold a significant amount of copies. It is a popular book for its genre. I need the exact amount for my book proposal because it will show that there is a large market for my book. I know there is a phone number of a place that has this information.

Sorry for my ignorance on this one. Any help is appreciated.

Thanks. I tried to do a search but no luck.

I found the information. For anyone who may need it in the future:

You call Ingram at 615-213-6803 and punch in the ISBN number of the book. The automated service gives you the number of copies sold.