If you’re planning on taking a ski trip this winter, you may be able to give your budget a lift.

Most ski resorts now offer online ticket sales at a discount. The catch: You must commit to the mountain and — in many cases — exact dates.

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For instance, Colorado’s Aspen Snowmass resort is offering four-day adult lift tickets during the peak of this year’s season for $476 at the ticket window. Purchase the same ticket at least a week in advance and save $40.

Utah’s Brighton sells a one-day ticket for $75 at the mountain. But a print-at-home ticket valid any day during the season is just $68.

For further savings, consider Liftopia.com, which sells advance tickets for specific dates. Locking in a lift ticket now for a Tuesday in early January at Brighton brought the price down to $53. In some cases, Liftopia adds in ski rentals or food vouchers.