If you are interested in either selling or buying on a legal car boot/rastro look here
http://blogs.timspain.com/?page_id=209
If you are coming from Alicante on the A31, come off at the first Sax sign, go over the motorway, to the island and turn right, when you get to the next island, turn left, once you have turned left, follow that road through to Salinas, as you approach Salinas there is a roundabout, you turn right here and the boot sale is on the right.
If you are coming from Pinoso toward Monovar, go through Mana, as you travel up the hill heading toward Monovar, there is a right turn signposted Salinas, go through Salinas, as you come out the other side of the village, there is a roundabout, turn left here and the boot sale is on the right.