Yes. eSIMAdvice currently lists 5 Nomado eSIM Guinea plans.
The cheapest Nomado eSIM Guinea plan is Guinea · 1 GB · 7 days · 3G, at $22.49.
Guinea · 10 GB · 30 days · 3G has the lowest price per GB right now: $18.45/GB ($184.49 in total).
Yes. The prices shown already include the ESIMADVICE coupon where it applies.