Cheap Last Minute Flight to Amsterdam?

Hi all. My mother and sister are here until Sunday visiting my husband and I. We've all been wanting to visit Amsterdam for quite a long time, and so we decided to try to make it over there overnight this week (leave on Thursday, return on Friday). Since this is so last minute, we're pressed for time and those are really the only days that we can travel. I've looked all over the net (travelocity, expedia, travelsupermarket, cheaptickets, jet2, etc) trying to find some sort of last minute deal, but have found nothing that costs less than £90 both ways per person, which we simply cannot afford.

I know I should've scheduled this further ahead of time, so I know that I can't really expect to find a great deal a mere three days ahead of when we want to travel, but I thought I'd ask here at UK-Yankee if any of you know of any deals going on at the moment or websites/travel companies that would be worth checking out since there seem to be a few of you who travel fairly regularly. Any suggestions or recommendations would be greatly appreciated! Thank you! 

Have you tried Ryanair, Easyjet or lastminute.com yet?

Try MoneySavingExpert's fabulous FlightChecker utility: http://flightchecker.moneysavingexpert.com/.

Easyjet recently had a sale and I know that we were looking at tickets to Spain for this weekend and they were £1 (around £22 with taxes).... If you can be flexible, it pays to check every day as they seem to change really frequently.

 I think starting tomorrow (Tues) Ryanair is having another 1p flight sale. It might be worth it to check it out, though there may be restrictions on when the flights are.

Try KLM. They are the main Dutch airline.

Thank you very much for your responses, everyone. I really appreciate your help. After checking out all of these sites and others, we've basically come to the conclusion that it was probably a bad idea to try and find a deal and fly out at the last minute (seeing as we don't have much time or spare cash at the moment). Instead we're just going to wait until the next time my mom and sister come over and make sure to find and book our flights well ahead of time. Again, thanks for your help!