Yes. eSIMAdvice currently lists 36 AlpineSIM Costa Rica plans.
The lowest displayed AlpineSIM Costa Rica plan is Costa Rica · 500 MB · 1 day · 4G, at $1.01.
Costa Rica · 20 GB · 30 days · 4G is the current best-value match by displayed price per GB: $1.90/GB ($37.90 in total).
Yes. Eligible displayed prices already include the active AFFINCO coupon where the provider rule applies.