I've been a member of the Quattro Club for several years, and it is well worth
the (normal) fee of $25. The club sponsors about half-a-dozen Auto-Crosses at
race tracks across the US (Brainerd, Lime Rock, others). These have included
high-speed driving instruction from pros as well as personal time trials. The
fees have been _very_ reasonable (less than $300 for a 3-day event). As well,
the club members participate in a number of performance car events hosted by
other clubs including a (closed) highway time trial in Nevada.