Mexico & the Caribbean from $59; domestic flights also on sale

Hi, all! Frontier is having yet another impressive flight sale from the US to Mexico and the Caribbean, with prices starting at $59 one-way.
They advertise $59-$79 flights from Denver, Chicago, Cleveland, and Philadelphia, and there are some super-cheap domestic flights, too. Now, round-trip might cost you about $200 if you buy now. They seem to stagger the sales in that way. A couple weeks ago, they had a sale for like $19 flights from Mexico to the US, but it cost more to get there. Now they have cheap flights from the US to Mexico...but it's more expensive to get home. Sneaky. Still, under $200 round trip is not a terrible deal. You can get more deals like this if you join Frontier's discount club, but they still throw us non-clubbers a bone like this every so often!
flyfrontier.com has the details, as always.

Spirit Airlines is having another awesome $34 flight sale, too! As per usual, tickets are even cheaper ($23) if you join their discount club.