K & J MAgnets have neat stuff
They have these:
and more
K&J Magnetics - Products
Dimensions: 3/8" dia. x 3/8" thick
Tolerances: ±0.002" x ±0.002"
Material: NdFeB, Grade N42SH
Plating/Coating: Ni-Cu-Ni (Nickel)
Magnetization Direction: Axial (Poles on Flat Ends)
Weight: 0.180 oz. (5.09 g)
Pull Force: 9.20 lbs
Surface Field: 4985 Gauss
Brmax: 13,200 Gauss
BHmax: 42 MGOe
If you are looking for a powerful magnet to put in your oil pan or attach to an oil filter, this is the magnet you need. The D66SH cylinders are made with grade N42SH (SH = Super High Temperature) material. The SH material means that the magnets can be heated to 300° F without any loss of magnetic strength, unlike standard neodymium magnets that begin to lose strength at 175° F. Suitable for many high temperature applications.
D66SH: 1 for $1.25 10 for $11.50 25 for $27.00 50 for $50.00 100 for $96.00 250 for $232.50 500 for $430.00 1000 for $800.00 2500 for $1,875.00
Looks like it is 96 cents plus a share of shiping.