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Div, Grad, Curl, and All That: An Informal Text on Vector Calculus, Fourth Edition
$27.61
The math world and the physics world are not consistent with one another in their naming conventions for the angles in spherical coordinates (which angle is theta and which is phi). (see the 3rd paragraph on this page [...])

The third edition of this book follows the physics convention, but the fourth edition switches to the math convention. This reduces the helpfulness and ability to use the book as a "quick reference" for a physics class, because one must remember to switch all of the variables any time spherical coordinates are used. This is so annoying that I am probably going to sell my copy of the fourth edition and buy the third edition.

If you are using this book for a reference for a physics class, I would highly recommend purchasing the third edition (or earlier) unless you enjoy being really confused and creating extra, unnecessary work for yourself.

Manchester United 3 x 12 Bumper Strip
$0.00
No Description

Type U and U-3 Envirocare Panasonic Vacuum Cleaner Replacement Bag (3 Pack)
$2.20
For optimum performance change your bag every 1-2 months!

Stack-On DIV-LG Large Storage Dividers
$9.23
The dividers are as offered, but they come in a sheet that is scored and you have to break them apart. The smaller ones break clean, but the larger ones are hard to separate. The larger ones do break after a lot of bending, so much so that I was afraid they would break before separating. After they do break, the edges are rough, so rough they don't sit down cleanly in the grooves in the drawers they are made for. I had to take fine sandpaper, lye it flat, and rub the divider edges on the sandpaper to clean them up.