Yes. eSIMAdvice currently lists 60 Billion Connect Mongolia plans.
The lowest displayed Billion Connect Mongolia plan is Mongolia · 500 MB · 1 day · 4G, at $3.25.
Mongolia · 30 GB · 30 days · 4G · 1 GB/day is the current best-value match by displayed price per GB: $3.78/GB ($113.43 in total).
Yes. Eligible displayed prices already include the active ESIMADVICE coupon where the provider rule applies.