Yes. eSIMAdvice currently lists 13 co:sim Belize plans.
The lowest displayed co:sim Belize plan is Global · 193 countries · 1 GB · 5 days · 5G, at $5.99.
Global · 193 countries · 1 GB · 5 days · 5G is the current best-value match by displayed price per GB: $5.99/GB ($5.99 in total).
Current prices are shown without an additional listed discount.