How much are the costumes on websites like Revolution, Stardom, Weissans, A Wish Come True, VS custom made

I found ballet costumes for a few of my solo students, but one is doing a very unique ballet style from a rare ballet, and the typical romantic tutu costumes won’t work. Some that have a more flowy skirt could work but they’re too transparent and lyrical. There‘a a nice costume I found on a higher end website but it’s $479. I’m thinking of asking the studio owner her thoughts on if we made a custom costume but I don’t want to if it’s rude as it can be very expensive. When I was dancing a few of my ballet costumes (high quality, no see through at all, proper design) would come to $600-$700 and that was 8 years ago not sure if it’s different.

If the price difference is not that big I wouldn’t mind asking, but I don’t want to put anyone in an awkward spot.