Yes. eSIMAdvice currently lists 4 Nomado eSIM Tonga plans.
The cheapest Nomado eSIM Tonga plan is Tonga · 1 GB · 7 days · 4G, at $35.09.
Tonga · 5 GB · 30 days · 4G has the lowest price per GB right now: $31.68/GB ($158.39 in total).
Yes. The prices shown already include the ESIMADVICE coupon where it applies.