Consumer Cellular is currently running a promotion called "Spring Into Savings". With this promotion, new lines of service that are activated within the promo period can get a $20 account credit.
This account credit is applicable to both new and existing customers who add a new line of service. The credit will be applied on the first invoice after activation for lines that will remain active until the end of the billing period.
The good news is that you can get the $20 account credit when you activate service under the plans they offer. You can also activate under the networks of T-Mobile and AT&T.
This offer is available until June 30, 2020 and is available through Target and Consumer Cellular's own website.