Need some advice on getting Broadway tickets cheap.?

The TKTS booths in Times Square and at, I think, Fulton Market maybe [?], sell half-off tickets on the same day as the performance. You have to wait in line to purchase and any particular show may or may not be available [they have a board that tells what's available, so you need one person to go up and look while the other holds the place in line]. Check the TKTS website for a list of shows that have been recently available [no guarantee for the day you're there, of course].

There are a couple of websites that sell discount tickets. If you do a search on "discount Broadway tickets", I'd think you could find them.

Good luck!

I find a lot of cheap tickets on TicketHurry, you can try them

You can try TKS. They sell the unsold tickets on the day they're for for half price.