Yes. eSIMAdvice currently lists 10 Ohayu Greece plans.
The lowest displayed Ohayu Greece plan is Greece · 3 GB · 14 days · 5G, at $8.54.
Greece · 20 GB · 90 days · 5G is the current best-value match by displayed price per GB: $1.60/GB ($31.94 in total).
Yes. Eligible displayed prices already include the active ESIMADVICE coupon where the provider rule applies.