You will never see them anywhere near $15 from a mail order place, that would be way below their cost to the distributors. None of the dealers that carried these kits ever stocked so many of them, that they would be left with a huge overstock. The stores that carried them in my area never had more than one or two of any version. They wouldn't order more until the ones in stock were sold. The high price was probably the reason for that.
I bought the stock hardtop (first variation issued), and was disappointed in it so I didn't get any of the others. These kits just didn't sell well enough; the high price combined with the shortcomings did them in. Had they been the same quality as a Revell or Moebius kit, the price might have been an irritant but they would have sold in spite of that. Had they been what they are, but priced in line with Revell or AMT, the accuracy issues would have bothered people but they would have done better. The accuracy issues and the price point together were too much to overcome.
After reading the first reviews, I decided to pass on them, even though the Falcon was high on my wish list.
What's worse is, that they probably killed the possibility of an all new kit (by the domestic kit makers), of this subject altogether..