Yes. eSIMAdvice currently lists 27 Redsim Mongolia plans.
The cheapest Redsim Mongolia plan is Mongolia · 1 GB · 1 day · 4G, at $3.67.
Mongolia · 20 GB · 30 days · 4G has the lowest price per GB right now: $2.25/GB ($44.94 in total).
No coupon is applied to these prices right now.