Amazon is an official reseller. And unlike most Cricket retailers, if you buy service through Amazon you don't pay an activation fee.

If you purchase Cricket service thru Amazon, and you're a Prime member, Amazon gives you 10% back as a GC each month.

https://www.amazon.com/Monthly-Subscription-Cricket-Unlimited-Hotspot/dp/B088339CS9

The iPhone packages aren't priced very well, but the bare service is a good deal for Prime members.

https://www.amazon.com/stores/page/41C89828-1FB0-4924-B958-7E2D91188C58