I started on my street tires even! All it cost was the entry fee for the event! (I went ahead and bought membership too because I love this shit)
Within 2 months I decided to get a spare set of rims and a set of race only tires to appease my wife after I flatspotted my aquatreads! I bought some Kumho VictoRacer V700s... oh god yes they stick!
(NOTE: Goodyear Aquatreads are NOT to be confised with any type of performance tire... they suck to high heaven but are good in the rain If you MUSt buy Goodyear get Eagle ZRs otherwise for street tires buy Kumho 712s or Falken Azenis)
Autocrossing is a relatively cheap sport that is less stressful on your car than dragracing. AND it teaches you how to handle a 25mph curve at 45mph! Best of all it has nothing to do with reaction time!
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-Shawn
(2 posts my a$$, I posted plenty in the autox section 3-4 years ago... GOD, i go on deployment ONE time and you reset my counter? lol)