The challenging thing about finding high school level textbooks is that the primary customers for such books are public and private schools, so they're not as easy to find as the books most commonly purchased by individuals - introductory college level books. It's been a long time, but I believe I used a Prentice Hall textbook when I was in high school, and the first result from Amazon by them is Hewitt's "Conceptual Physics: The High School Physics program".
Another route you might try is to look into popular physics books written for the laity. I haven't read Khun's "Basic Physics", but it's inexpensive and highly rated on Amazon. Since it's labeled as a "Self teaching guide" it might be more appropriate to your needs, though I cannot vouch for it being high school level.
Also, what do you mean by high school level? Conceptual where you don't have to do any algebra (at most, you plug some numbers into a few formulas)? Quantitative where working knowledge of algebra and geometry are prerequisite (where you are expected to combine formulae to make new ones)? Or undiluted, where you don't just learn the formulas, but also the calculus that defines how they're related to each-other? When I think of high school level, either of the first two are eligible. College level can fall into either of the last two.
Giancoli's "Physics: Principles with Applications" straddles the latter two and is probably the leading textbook for the big introductory courses where instructors want the jack of all trades, but the master of none. A lot of people swear by the The Feynman Lectures on Physics, but I don't know how much people actually use them as their primary learning resource instead of as supplementary material. If you want introductory texts solidly in the third category, then you can't go wrong with Kleppner and Kolenkov's "An Introduction to Mechanics" followed by Purcell and Morin's "Electricity and Magnetism", though they don't cover any of the introductory fluid dynamics or thermodynamics that is in most introductory courses.
Suskind's "Theoretical Minimum" series (including: "What You Need to Know to Start Doing Physics", "Special Relativity and Classical Field Theory", "Quantum Mechanics"), combined with his online lecture series, might also appeal, though they're targeted at someone who's interested in achieving a calculus level understanding of the material, if memory serves.
Also, I would recommend you do your best to get things to do some experiments - like a meter stick, stop-watch, etc. You only really get a grasp of what this stuff means, and it's limitations, when you put it in to practice. Watching videos and simulations are helpful, but not enough. There's no substitute for going hands on, making the predictions yourself, and experiencing the challenges in performing a quality experiment.
