I have yet to actually buy any hair accessories, because we don't know the gender, but I have seen lots of bows and other hair accessories at every Kid to Kid I have been to.
She always has them to match all of the gymboree outfits, and has done some adorable custom bows for me. She is in San Antonio, so you get them really quickly.
I also have a million from this lady. She is awesome and will make ANYTHING! She is in Mansfield, but will send them to you as well.
I buy a lot of mine from Five Blessed Bows.com because they match Gymboree, Janie and Jack, and Gap. I'm OCD about bows and have to have a bow for each outfit. I just email what outfits I have and they make the bows.
Re: Bows...
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DFW Knotties
Etsy has a ton of sellers with adorable bows, but I get pretty much all of A's little ones from Very Sweet Bows.
https://www.etsy.com/shop.php?user_id=5609985&ga_search_query=verysweetbows&ga_search_type=seller_usernames
For bigger bows and headbands I like
www.bloomingbows.com
and
https://www.pinkbowtique.com
Ella Bella in Southlake has a very good selection of bows too, but that would be a pretty good hike for you.
I've bought a ton from this lady.....https://www.etsy.com/shop.php?user_id=5143161
She always has them to match all of the gymboree outfits, and has done some adorable custom bows for me. She is in San Antonio, so you get them really quickly.
I also have a million from this lady. She is awesome and will make ANYTHING! She is in Mansfield, but will send them to you as well.
https://www.cutestuffboutique.com/
A lot of the consignment shops have them - I know Kid 2 Kid in Allen always has a wonderful selection.
As for Etsy seller, I ditto Jessi's suggestion, and here are my three top faves:
https://www.etsy.com/shop.php?user_id=5637607 - she usually includes a bonus clippie too
https://www.etsy.com/shop.php?user_id=5573800 - her sets are really nice for matching with Carter's outfits.
https://www.etsy.com/shop.php?user_id=82598 - really cute bows!