Readily available in the UK Stuart. in different nib thickness.
EG:
Uni POSCA Marker PC-3M Fine
Available in 17 colours: Black, Blue, Red, Green, Brown, Yellow, Pink, Violet, Orange, Light Blue, Light Green, Bright Yellow, Light Orange, Grey, White, Gold and Silver.
Price: £2.20 (£1.91 excl. VAT) EA.