Yes. eSIMAdvice currently lists 3 eSIM4Travel Cuba plans.
The cheapest eSIM4Travel Cuba plan is Cuba · 1 GB · 1 day · 4G · Etecsa, at $15.92.
Cuba · 1 GB · 1 day · 4G · Etecsa has the lowest price per GB right now: $15.92/GB ($15.92 in total).
Yes. The prices shown already include the ESIMADVICE coupon where it applies.