Open Edition MagicBands are bands that should be available from Disney for an extended period of time and aren’t arbitraily limited in any way. They are the most basic MagicBand, generally have the most basic graphics, don’t come in a special box, don’t make any special effects at touch points, and currently cost $22.99 (up from $19.99 previously from 2014-2015). They may have an A pricing sticker on the back of their packaging to indicate that they are Open Edition. Some bands that have glow-in-the-dark effects have sold for $29.99 and don’t have a pricing sticker on them, but are still considered Open Edition.
Open Edition doesn’t mean the band will be around forever through, and as some have gone out of print they have become rare and harder to find. I don’t keep stock counts on my website, so you will need to look at official Disney merchandise stores to find out if they are still available. I have included a barcode SKU that you can use with Disney employees and Cast Members to look up the stock for you.