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