Yes. eSIMAdvice currently lists 133 Stellar eSIM Serbia plans.
The lowest displayed Stellar eSIM Serbia plan is Serbia · 1 GB · 7 days · 4G · + Free VPN, at $0.41.
Serbia · 10 GB · 1 day · 4G · + Free VPN is the current best-value match by displayed price per GB: $0.30/GB ($3.03 in total).
Yes. Eligible displayed prices already include the active ESIMTWEAKS coupon where the provider rule applies.