Math Tutor - Pre-Algebra Tutor Volume 1 is available for $26.99 here.
Math Tutor - The Texas Instruments TI-83/TI-84 Calculator Tutor is the same price and available here.
The Math Tutor website is very easy to navigate. They have sample videos and a full listing of what is on each DVD. Their product line covers Basic Math through Calculus, Physics and Probability and Statistics. The site also offers worksheets for Basic Math, Algebra 1 and Algebra II.
My oldest really loved the Pre-Algebra Vol I. Jason, the instructor, has a pleasant voice and engaged him easily. (This is a tough thing to accomplish) My oldest was riveted to the first section - even though it was about an hour in length. I liked the way Jason explained concepts and that there was no special text to buy in order to use these DVD's. Though my oldest isn't quite at Pre-Algebra level yet he got a lot out of this DVD and we will be using it in the future.
Pre-Algebra Tutor Volume 1 consists of two DVD's - about 5 hours in length total. Disc 1 covers Real Numbers, The Number Line, Greater Than, Less Than, Equal To, Absolute Value, Adding Integers and Subtracting Integers. Disc 2 covers Multiplying and Dividing Integers, Powers and Exponents and Order of Operations.
Given the fact that my son asks to watch more of this DVD daily and retains so much of what he learned we will be using this series to supplement his math studies in the future.
Even though none of my children are at the level for The Texas Instruments TI-83/TI-84 Calculator DVD I did let my calculator obsessed 8 year old watch part of this DVD. He now wants one of these calculators for Christmas. Since he's the child who knows square roots already he'll get one. Then he can watch the rest of the DVD. We do not have a calculator of this type but when we do get one I am sure - based on our viewing - that we will be able to use it and get the full use of it.
This set is 3 DVD's with 37 sections covering all of the functions of this type of calculator. A full list of the topics covered can be found here.
I highly recommend both of these products. They are especially helpful to someone like me - who is not math oriented but has at least two kids that are very math oriented.
To see what others on the TOS crew have to say about these products click here.
Disclaimer/Disclosure: I was given use of this product for the purpose of obtaining my honest opinion. I received nothing else. This is my honest opinion. Please consider that every family is different and results may vary.