Yes. eSIMAdvice currently lists 25 Stellar eSIM Niger plans.
The cheapest Stellar eSIM Niger plan is Niger · 1 GB · 1 day · 4G · FUP1Mbps + Free VPN, at $2.55.
Niger · 5 GB · 1 day · 4G · + Free VPN has the lowest price per GB right now: $1.90/GB ($9.52 in total).
Yes. The prices shown already include the ESIMTWEAKS coupon where it applies.