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[Dave Britten]

If you have to bite the bullet and buy an alternative calculator for this class, head over to ebay and buy a cheap Casio fx-9860G (any version; the Slim is very nice, but the OS 2.0 upgrade for that model isn't as readily available). The Casio will do matrix dimensions up to 999 vs. only 99 on the TI-84, and it can also do vectors (fx-9860GII only) and complex matrices. You shouldn't have to spend more than $40.

Alternatively, an old TI-85 for ~$20 will give you pretty good matrix and vector functionality.