I've had a look at the site and the only things I have at present with which to compare prices are Imation's 52x CD-Rs with cases (10 in a pack) at £5.99 per pack or three packs for £10 from Morrisons/Safeway, along with average Secure Digital card prices.
Jetaudio lists these superb quality CD-Rs, also cased in 10s (100 pack), at 29p each excluding VAT (£34.08 with VAT) plus delivery costs.
I think I know from which outlet to acquire fresh supplies (120 for £40) I'll be using...:-)
Jetaudio also doesn't seem more competitively priced in relation to SD cards.
But it's good to know that the company has provided you with good sales and after sales service - along with personal recommendation it's the best route to success for any business.