Yes. eSIMAdvice currently lists 26 Stixrs Guam plans.
The cheapest Stixrs Guam plan is Guam · 1 GB · 3 days · 4G · Fixed, at $6.30.
Regional · 4 countries · 60 GB · 30 days · 4G · North America 2 GB/day has the lowest price per GB right now: $1.43/GB ($85.95 in total).
Yes. The prices shown already include the AFFINCO coupon where it applies.