I sell to certain LFS usually non-chains that I personally know the owner and how they care for their betta there is one in particular that has each fish in jars that they clean everyday and each male has a bubblenest everytime I go in. I also tend to give them away to friends or people I trust to care for them.
I have many friends who are betta fans, I will have them all with collections by the time Im done with them lol I know at least 10 of my babies will get good homes thru them and another 25 at least for my LFS, I know the lady well and she is the only pet store in town so she gets good buisness and will take good care of them, besides she has to drive 2 hours to get the fish she sells now, Im sure she would be happy to save that trip. Anyway, I know by your other questions you still have alot of work ahead of you, and the truth is, even if you get a spawn in the near future, it may take a few trial and error times to get your fry to survive long enough to go to new homes. Do a ton of research and make sure you have everything before you attempt any spawning steps.
If my eggs from last night hatch and make it to the sell/give away point, they'll be going to family and mernincrazy will get first pick :) I have a very large family, 57 cousins on one side, and they all have kids as well. So no baby will go unwanted or mistreated!
LFS (not chains usually), friends, family, Aquabid, etc.
With my spawn I know a few on here would gladly take them, as well as Aquabid will get rid of quite a few. Then I would offer them up on my Facebook, maybe post some on Craigslist if it was a large enough spawn and I could find people I felt would care for them properly. I'd even post up an ad in some fish stores, too, for serious betta keepers...
I see. I've most definitely done enough research to consider breeding my fish.
So my LFS would be a good place to sell my babies if I ever had any. I know the owners daughter(as a matter a fact, we go to school together) and I'm sure I could get them to put out Jars instead of plastic cups...