USAFRet - Was that a sale price or normal price.
Reason I ask is that three -> five Monthes ago I bought both a 256 gig M4 and a 256 gig 830 both for $170 ON sale. Their normal price was Approx $200 -> $210 at that time. Looking to day the M4 is still normally priced @ $199. Bought the Samsung 256 gig SSD for around $200 on sale and it is the same price (not on sale) as it was then $240
Ref:
http://www.newegg.com/Internal-SSD/SubCategory/ID-636
Will say that the "Spot" price of NAND does sea-saw (sinewave effect), so yes the prices can fluxcuate 10 % and tends to be seasonal. Then again as I indicated, Demand/availability also plays an important part, and demand for SSDs is constantly rising - Face it Stores will try to maximize profit and take advantage of increased demand.
For pjmelect, there is also the possibility that that Hidden taxes have increased in the UK, and The EU in general. Both here and "over-the-pond" Government’s are trying to increase tax revue.