Found while looking for a new phone for my mom, seemed like a pretty great deal.
Samsung Galaxy S10 128gb in Black, Blue or White for $15 a month for 24 months with new line or account through Best Buy. According to the page you will receive a $50 Best Buy egift card with purchase as well.
If you'd rather have the S10e, it's also marked down to $10 a month for 24 months making it $240 with new line or account. egift card is eligible for this as well.