The Ultraboost 21s are OOS, but the Ultraboost DNAs are not.
Ultra good price for adidas Ultraboost 21s, $103.99. Sizes 7-12 used to be in stock, seems like the smaller sizes are the only ones available now. Other adidas Ultraboost 21s like the black colourway and the DNAs that are on sale ($90.99 for the DNAs (and some of the Ultraboost 21 colourways), also different sizes in stock):
Since I may not have listed everything, here's the product list for all the Ultraboosts.
Womens' Ultraboosts are also on sale for the same price.