There are many web shops for field workers. I found one british  shop – Archtools

The UK’s leading supplier of archaeological tools, trowels and equipment

Sample prices

  • Trowels: £9.00 – £12.99
  • A3 Pre-cut Drafting Film (Permatrace) 75 Micron X 50 Sheets – £37.00
  • Shovel and spades – £6.99-£19.99
  • Archaeology Photo Identifier Cards – £11.99
  • 100 Grip Seal Bags 57 x 76mm (160 Gauge)- £1.00

Shipping costs: Royal Mail – Parcel Force  – €12.08-€46.08 (expensive!)

Archtools Catalogue

http://www.archtools.eu