go to aquabid.com and look around there.
There 2 expensive there asking for 20 bucks for a veil tail...And thats without the shipping...
Actually, I bought 1 GORGEOUS female Blue Marble Super-Delta from Aquabid for $6 + $20 shipping. If you get Priority, it's only $10. And the breeder sent me 4 sibling girls for free! I actually sold 2 of the girls to people from my Betta club and I made back all of the money I spent on them
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There are PLENTY of good deals on AB, if you are patient and check around often.
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sorry about your baby. I don't really understand how she could've died of fin rot without you noticing ~ because usually Bettas die of fin rot after it has reached or is near their body, and then it's SEVERELY noticable. But, she also could've gotten infection. Just an FYI, that was most likely because she was in a 1/2 gallon tank with an ADF. That's just too much waste in too little water, unless 100% water changes were done every single day.