Depends on the wood, they can only cut up to 2" thick, so they won't cut posts for you and the such

This. Get sons tools

Just buy a saw and spend a few hours. The only way to get exemplary service from a big box hardware store would be to have a huge set of knockers.

yeah this isn't true at all

do you have a big set of knockers?

You can steal from home depot very easy..

Get one of those carts, lay 4 sheets of sheetrock on top (cost $3 or something each), underneath those sheets stack 2 or 3 bathroom acrylic plastic sheets, they are very thin and cost ~$80 each.
Go to check out and say "4 sheets of sheetrock" .. the cashier wont look underneath because its barely noticeable and wont bother lifting the heavy sheetrock sheets.

Then go around the corner dump the sheetrock on your truck or whatever, and return the acrylic plastic sheets.. easy $160-$320.

or just put in on a trolley and walk out the door - if you look confident no one will even stop you

I'm building a cabinet

Lol

Plus or minus kerf derp