Sylvain writes:

about 8 bucks; and I religiously replace the one where I fly regularly

So you just need one sectional that you use for the majority of your
flying?

but there are other options: I started using the 'Air Chart Systems'
which is pretty neat; you get an atlas with all the sectional for the
western half (or eastern half) of the country, and regular cumulative
updates in the mail; when planning a flight I look at the latest
update to see what changed if anything along the route I want to
fly and I am set.

How much does that cost?

I buy the terminal charts and AF/D separately though.

How much are they?

How much do you spend a month overall just updating charts?

--
Transpose mxsmanic and gmail to reach me by e-mail.