Cheapest Way To Get To Amsterdam In Late August From London?

Trying to get the cheapest means of transport possible so we have more to spend when we’re there and more to spend on accomodation.
I’ve tried Ryanair, but they don’t bloody fly there! EasyJet prices were a little bit more expensive than I would have liked. Do they go down if you get a last minute deal?
We were planning to use Easyjet and then Hotels.com.
Would a ferry be cheaper? But we’d much prefer to fly.
Any suggestions?
Cheers :)

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