method of payment
A way to pay, like cash, a debit card or a credit card.
estimate
A close answer you can find quickly in your head.
change
The money you get back when you pay more than the total.
saving
Keeping money aside to use later.
investing
Putting money somewhere so it can grow over time, with some risk.
need
Something you must have to live safely and be healthy.
want
Something nice to have that you can live without.
reasonably priced
A fair price for what you get.