Overall sales numbers aren't given on amazon but its easy to see that there only stocking 10 at a time and once they sell them 10 it shows delivery expected 1-2 months (showed this when first listed and just after first 10 where sold ) until another order is sent to them which it shows expected delivery shortly (which it showed just before original ones first went on sale and just before these 10 where listed ) my calculations is 13 sold
