In the UK, provided that the retailer tells you up-front that payment will be taken at the time of ordering, there's no issue with doing this. But they have to give you the option of cancelling your order if you decide at some point that you don't want to wait any longer.
Are you talking about Endless Ideas (BeBook) in the Netherlands? I ordered my BeBook Neo from them. I had to wait a few weeks, but it was well worth waiting for.
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