Yes. eSIMAdvice currently lists 12 Maya Mobile Laos plans.
The cheapest Maya Mobile Laos plan is Global · 178 countries · 15 GB · 3 days · 5G · 5 GB/day high speed then 3 Mbps, at $8.99.
Global · 178 countries · 150 GB · 30 days · 5G · 5 GB/day high speed then 3 Mbps has the lowest price per GB right now: $0.30/GB ($44.99 in total).
Yes. The prices shown already include the ESIMTWEAKS10 coupon where it applies.