The sale should be good through June 7th, and I'm personally going to scoop the lot; I've just been waiting to see if the Canadian dollar bounces back up a bit (stupid panic-trading CAD-dumping investors late last week driving the exchange rate up with their stock market shenanigans).
BVC practically never discounts their stuff. Incidentally, author member Pati Nagle is discounting two of her 1st-in-series titles to $2.99 (down from the 4.99 it's mostly been for the past two years),
details and coupon code on her page. And YA author has set the introductory price of her 1st-in-series SF
space opera novel to 99 cents (don't know if this is a temporary sale or a permanent discount; might as well scoop it anyway, to hopefully encourage more lower introductory prices).
Though personally, I'm rather disappointed that with the new site, they've decided to eschew the MultiFormat downloads + online reading with your purchases kept on the site in favour of 1 purchase per format with a single non-recoverable download link. (Not to mention, I used to direct a lot of people to the online reading shorts and novellas to try new-to-them authors I was recommending, but no more of that now, I suppose.)
You'll definitely have to make your own backups this time around.