Hi Aubrey, thanks for joining the team!
Personally, prices ending in .99 do not bother me and I would never view an item as "cheap" just because of the .99 price.
Although, buyers on Etsy do tend to buy items ending in .00 because they view .99 as a sale, or clearance price.
If I were you I would change a few of the listings to end in .00, and see what happens.
Good luck, and happy selling!
Summer