techniques to obtain ' red' I employ are :
- on arrival at Swampy buying 45 baht token for ARL at the counter and paying with 1000 baht note
-when exchanging money asking to give me 2000-3000 in hundreds , sometimes it works , sometimes not, never hurts to try. XOne often obliges
- when buying something trying to pay with 1000 or 500 note , even if that's just beer or KY
-topping up Rabbit card with 100 baht but paying with 1000.
In bars though I prefer to pay with exact change as I know few cases / not mine fortunately / when change from 1000 was given like only 500 baht was received from customer