Christmas suggestions for my girlfriend please!

My girlfriend loves all sorts of puzzles, she is constantly playing games on her phone, PC and DS. Games similar to Professor Leyton, escape simulator and all manor of random things.

Recently I have noticed she's also been watching a guy called Chris Ramsey on youtube where he constantly tries to open wooden puzzles. I have been informed these might be out of my price range for a surprise xmas gift but was looking for suggestions on where to start for UK based puzzle xmas gifts under £50 similar to the ones in his video if possible that will hopefully keep her busy for as long as possible!

TIA