How to book bus tickets at a cheap price? Suggest any tactics or promo code

Folks, Any hacks to book flight tickets with good discount. Need to book for a family trip for 5 members. Any website/card/voucher etc is fair game. I'm not sure what gives more value these days

How to book cheap domestic flights?

Which website or agent do you use?

Another trip in the pipeline, and have to book tickets this week

Feel free to share your discount coupons (over DMs) 🫣 TIA