I'm looking for some routines that involve steel core coins, or any other money magic using magnets. Does anyone have any suggestions?

It is a fairly simple trick, but I use a steel core quarter for the last coin in CoinSqueeze. That and a PK ring makes for the quarter's complete disappearance. You can find CoinSqueeze, quarter size, at just about any magic shop. It is a great close-up trick.

Paul Diamond edited in 1971 a book called Magneticoins by Frederick L Kraft & Arthur Kraft as the N°1 of his Gems of Magic Series.
He also edited in 1973 another one by the same authors called Magnetrix, N°3 of his Gems of Magic Series. These two little books have a number of secrets which would nail present magicians to the wall, but the secrets are buried for a long time.

Kardyro, Tony: Close Up Deceptions. Contents include on p. 9: T.K.'s Copper & Silver Routine Supreme: using magnetic copper & silver coin set, regular copper and silver coins, shell, and handkerchief.

Lewis Ganson: The Art of Close Up Magic Volume 2. Illustrated by Dennis Patten, 286 pages, hardbound. p 103 Coins Apart: Eight coins are shown, four each of two colors. Spectator dumps them into performer's hand. A wand is pushed through twice, and the coins are now separated in each hand. 4 of the coins must be of a magnetic material.

Wow, Lawrence, thanks a lot. I'll have to check our those Gems of Magic series.
And, amerigo, a CoinSqueeze... I could get some good mileage out of that.
Thanks, guys. If anyone else has any suggestions, I would be glad to hear them.