I just happened to be searching the net for some challenging number puzzles for my Year 7 Maths class, specifically something to do with getting to a target number and Google happened to list your website. I clicked on the link, had a go at some of your samples and really enjoyed them. I trialled a couple of the sample activities with my students and they really enjoyed them so I thought I would purchase the sets you had on offer. The puzzles will certainly become a regular feature of my Maths program.
 
Keep up the great work,