Something I noticed over the years with "sealed bearing" hubs is that sometimes, it means there are either rubber contact seals or labyrinth type seals. And sometimes, it means sealed "cartridge" bearing hubs. The two are different but unfortunately, a catalog, especially online, may not present sufficient information to make that determination. So it may be worth while to go and peruse and buy from your LBS. The price for a good set of sealed cartridge bearing hubs can vary. But amortized over the years of service, and the ability to swap cartridges and make an old hub run like new may be well worth the cost of buying them where you can examine the fit and finish of the product. I think I spent around $80 on a pair of Specialized sealed cartridge bearing hubs 20 years ago at my favourite LBS. I'm still riding them, and replaced just the right, FW side bearing twice and all the rest are original and still pretty slick. I think, even with $8/cartridge bearing for some high end ones, that's only still around $5/yr in hub costs and minimal maintenance.