Yes. eSIMAdvice currently lists 99 AlpineSIM Bulgaria plans.
The lowest displayed AlpineSIM Bulgaria plan is Bulgaria · 500 MB · 1 day · 4G, at $0.40.
Bulgaria · 10 GB · 1 day · 4G is the current best-value match by displayed price per GB: $0.51/GB ($5.11 in total).
Yes. Eligible displayed prices already include the active AFFINCO coupon where the provider rule applies.