Here are some tips to help you look for all you can eat sushi in Las Vegas on line.
To start with, check out the listings provided by search engines like Yahoo and Google. Although the original listings are provided by the search engines themselves, they require verification from their owners. You should prioritize restaurant listings that have been verified as these are likely to be active or operating as well.
In the case of unverified listings, you would have no choice but to call these restaurants one at a time. Inquire about their operating hours as well as what their rates are for all you can eat sushi. Be aware that some restaurants offer all you can eat sushi only on certain days of the week. You should also keep in mind that most of these restaurants have no-leftover policies. If you are taking your kids with you, it might be wiser to let them order ala carte.