I found a great site for purchasing microfiber detailing clothes. They are cheap but are of high quality (very plush with no stitching on the edges). Also, every Friday has free shipping. Check it out. Microfiber Detailing Cloths, Towels, and Supplies
Blue Microfiber are the best I find the best to be the blue type micro fiber cloth because of the fiber used which is different then the other colors. Target has a great package of 10 medium size for under $10. They have lasted a lot of washes so far and still work like new. I found the larger ones at Pep Boys again under $10 the ones for polishing and the one for absorbing water. They are huge. High quality.