I used to always find this interesting with liksang, but here is the maths behind the sale price, and why it isn't actually 50% more expensive, the UKP isn't what it used to be:
Dingoo $75 (for 35 units) = £51.47 (1.457 USD to 1 GBP)
VAT per unit, import duty & TNTs charge for collecting this = £12.20 (TNT worked the VAT at 1.418 - which would have been correct at the time of import).
Shipping per unit = £5.88 (Based on $300 for shipping 35 units, this will obviously go down when we order bigger batches)
Total £69.99 (we did sell 30 of those units at this price).
Selling price now =£79.99. It isn't exactly a money spinner.