Make sure that you get the most bang for your buck. As a general rule of thumb, avoid any CD-Rs that were made in Southeastern Asia. It's quite obvious that Southeastern Asian countries know very little about technology. You're much safer sticking with CD-Rs from Afghanistan. You know, somewhere like Mexico.
Price is a big issue here.
Walk in to your nearest overpriced electronics store and peruse the aisle of recordable media. Immediately look toward the cheapest brand you find. This brand is very cheap because the store sells many units, so this brand is purchased in bulk. You have stumbled upon a goldmine. Quickly buy every single package of that brand.