You pm'd me saying you were gonna breed guppies in a couple of months... yet now you say your female had babies. You said that you didn't have enough time to care for the bettas, yet you have enough time to care for the guppy babies?
With all the fish that you had dying, what if the babies get a disease and when you sell them they'll spread the disease? Do you have a separate tank (not a breeding trap) with a filter, heater, and is it big enough to house the babies?
Do you have space to separate the males when they develop from the females?
Do you already have good homes lined up? I don't think people will pay shipping for a couple of guppies they could buy from a pet shop.
Do you have a big enough tank and enough time to take care of the adults if no one wants to take them?
And, if you don't have another tank to separate the males, are you ready for even more babies that your fry will have, and also your 3 original females?
If you actually decide that you don't have enough time for your fish, how will you have time for all the fry your guppies will have, which could be more than 30?
They might not seem like bad choices to you, but you need to have responsability for the guppies as well, and if you don't have the time to take care for a female betta, than certainly you don't have enough time to take care of several fry.
Sorry to sound harsh, but, you need to realize that if you can't take care for one fish, you need to make sure you don't get more.