(Following is not in accordance with standard horary delineation and uses whole sign house format)
By the Primary Ankara (Ottoman astrology) horary method:
a) you (first house significator) and car (second house significator) are the same, ie, Saturn
b) which means (in the Ankara tradition) that the condition of the joint significator determines the outcome
c) Saturn is in the 10th house of success, and in its exaltation sign of Libra
d) which means that you will be successful in getting the type of car you desire
BUT WHEN?
a) by the time the indicator of change, the Moon (universal significator) reaches Saturn (you and the car) IN THE CHART
b)...which is 6 signs, and with cardinals on the pivots I'll take this as 6 weeks
c) but possibly this will happen only when you and the car (ie, Saturn) actually reach your exact exaltation degree-20 degrees of Libra-when that actually occurs in space, that is, in the ephemeris
d)...which is 4 degrees from where Saturn is now posited (in the chart)
e)...which will occur on October 13th of this year (2011)
So, my estimate is between 4 and 6 weeks from the date of your question, ie, in the time period from today through October 13th to as late as October 26th, 2011.
WARNING!
The distance of 6 signs from the Moon to Saturn MIGHT, however, be MONTHS rather than weeks! I am standing by the maximum 6 week prognostic, but if you can't find your car by the end of October, it might well be that you won't until March of next year! But I'll stick with my 6 week prognosis from the latest chart.
Note:
In the first chart, which indicated a "no" answer to the question of your buying a car within 30 days, the car significator, Mars (lord of Scorpio on the 2nd whole sign house) was passing through the SN-polluted Gemini, and would then pass on into Cancer, the sign of Mars Fall! This might well have indicated something which is still valid, ie, that Mars must be free of Cancer-pass out of Cancer-before things open up for the purchase of the car. If this is in fact an element to be considered in this current situation, then know that Mars passes out of Cancer (into Leo) on the 19th of September, so perhaps things will finally begin opening up, start to become more favorable, for the car purchase beginning as early as this coming Monday-lets hope so!