Blackpool Pleasure Beach are giving a discount of £5 off adult tickets when bought online and more than 12 hours prior to your visit.
I've taken a look at the prices... With the discount, it's £25 for Weekends and Bank Holidays and £21 during the week. Tickets for dates on or after 23rd April are just £15 during the week and £21 at weekends (again, including the discount).
The price includes almost all rides and, if you wish, tickets to the matinee performance of the brilliant "Hot Ice" show. Entry to the park for visitors who don't wish to go on the rides is free for the 2008 season.