For your second question, check out the comment there.
For your first question, a short while ago SparkFun started adding a back-in-stock estimate to product pages for which they have such an estimate. Look for it under the pricing details. Right now it states that they’re expecting to have these back in stock on May 25th, 2013 (writing this on May 20th, that means in a few days), but keep in mind that this may change (supply issue, Boulder’s infamous snowstorms, etc.)
You can also press the “Notify Me” button a bit further down still. That way you’ll get a reminder e-mail when the item is back in stock for sure.