A bunch of reasons.
Thomann may be sitting on some old stock they bought at a lower price than buying some today. Maybe they're overstocked and want to clear them out.
Pmt are advertising full rrp without having any in stock to generate some interest, different distributors between uk and Germany, different buying power.
I’d shoot pmt a message with the thomann link asking for their actual price. I’d expect them to come down a bit.