Yes. eSIMAdvice currently lists 43 Redsim Sri Lanka plans.
The cheapest Redsim Sri Lanka plan is Sri Lanka · 1 GB · 1 day · 4G, at $2.23.
Regional · 18 countries · 90 GB · 30 days · 5G · Asia 3 GB/day then 1 Mbps has the lowest price per GB right now: $0.75/GB ($67.40 in total).
No coupon is applied to these prices right now.