Yes. eSIMAdvice currently lists 10 Ohayu Hungary plans.
The lowest displayed Ohayu Hungary plan is Hungary · 3 GB · 14 days · 4G, at $6.74.
Hungary · 20 GB · 90 days · 4G is the current best-value match by displayed price per GB: $1.33/GB ($26.54 in total).
Yes. Eligible displayed prices already include the active ESIMADVICE coupon where the provider rule applies.