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Getting Your A** Ready for College Math
By an Amazon.com customer
Texas Instruments TI-83 Plus Graphing CalculatorTexas Instruments TI-83 Plus Graphing Calculator
Buy new: $94.99 / Used from: $25.00
Let's assume you are going to take more than the "basic" courses in math, but you're not a science major.  Start with a good, decently priced calculator.  I recommend the TI-83.
Texas Instruments TI-89 Titanium Graphing CalculatorTexas Instruments TI-89 Titanium Graphing Calculator by Texas Instruments
Buy new: $139.72 / Used from: $99.01
Comp Sci?  Engineering?  Physics?  Applied math?  Spend the extra bucks and get the TI-89.  It'll last you all four-to-five years.
Schaum's Outline of College AlgebraSchaum's Outline of College Algebra by Spiegel
Buy used from: $2.00
You WILL need to do some reviewing before classes hit.  I love Schaum's Outlines for this. 
Schaum's Outline of TrigonometrySchaum's Outline of Trigonometry by Robert Moyer
Buy used from: $0.01
You'll need this one to review if you're in a technical field
Schaum's Outline of PrecalculusSchaum's Outline of Precalculus by Fred Safier
Buy used from: $0.99
Even if you've taken AP Calculus, this a good place to review. 
Everett Pad & Paper Quadrille Filler Paper, 3-Hole Punched, 8 1/2in. x 11in., 16 Lb.Everett Pad & Paper Quadrille Filler Paper, 3-Hole Punched, 8 1/2in. x 11in., 16 Lb.
Why graph paper?  It'll be easier to sketch graphs & functions.  For a visual learner, this stuff is indispensable.
Introducing Mathematics (Introducing...(Totem))Introducing Mathematics (Introducing...(Totem)) by Ziauddin Sardar
Buy used from: $0.88
I gave this a so-so review, but it really will spark your curiosity about math and its history.