Cantonese : A Comprehensive Grammar + Teach yourself : Cantonese
https://www.bookdepository.com/Cantonese-Stephen-Matthews/9780415471312?selectCurrency=USD&redirected=true&gclid=Cj0KCQjwqvvLBRDIARIsAMYuvBHLTXy4gZoJDg3gi-8YX9SWSOWzSeB9hVjqnlWSl1e4KiSUY9DqV_UaApSOEALw_wcB
Beginner Cantonese video #2 Learn to ask for the price of a product
https://youtu.be/eh8vl2OwXMk