BlueSeaArts looks like nice quality, and good prices. I like all the info in "Shop Announcement"- very helpful and transparent.
Lamanda and Melia looks like they also do very nice work within a reasonable price range, and have more sales and good reviews.
Some of the others I looked at seemed out of your budget, or unable to complete a custom painting in a timely manner.
Hope this helps!
Stay strong, sweetheart!