Yeah saw those bit pricey but, some others ive seen have been not much more for a pack of 100, also ill be bottling in champagne bottles not sure if they have the same size cork or mouth opening
I've had some Belgian beers e.g. Pecheresse that have a standard cork and a crown cap (29mm) on a Champagne bottle.
I use the Plastic 'mushroom' stoppers with a wire cage.