Yes. eSIMAdvice currently lists 43 Billion Connect India plans.
The cheapest Billion Connect India plan is India · 1 GB · 1 day · 4G, at $1.29.
India · 90 GB · 30 days · 4G · 3 GB/day has the lowest price per GB right now: $0.70/GB ($62.74 in total).
Yes. The prices shown already include the ESIMADVICE coupon where it applies.