To charge, or be charged, several unexpected small amounts of money, often in the form of fees, taxes, or related expenses to a venture, which when taken as a whole add up to a significant unexpected cost
It seems like a great offer, but they will just nickel and dime you until you've spent more than retail anyway.
Small time; operating on a small scale; involving small amounts of money; petty or cheap
Don't waste your time with that; their operations are nickel and dime.
To wear down in small increments; to quibble or obsess endlessly with (someone) over trifles
1. (verb) harass by charging for many trivial items. 2. (adjective) unimportant; trivial
nickel-and-'dime to not give enough attention or money to something, with the result that it is not dealt with effectively. unimportant or involving little money
accumulate gradually; "she nickeled-and-dimed together a small house for her family"
of minor importance; "a nickel-and-dime operation run out of a single rented room"; "a small-time actor