@egamar would you be willing to ship to the United States?
Yes, of course. Small envelopes are quite cheap when not tracked/insured, but start costing nearly as much as parcels when tracked/insured; small parcels (up to 2kg, say) range from £10 - £15 uninsured, maybe £25 insured to £50; and then up to £27.50 insured to £100.
Other options are available for larger parcels, but increase fairly rapidly in big steps as dimensions and weight go over certain thresholds. Example: 2.8 kg 36x15x16 cm is roughly £38, but 2.9kg 40x16x17 is £50.
I would always recommend fully insured shipping to the US for anything but items of trivial value: once it gets into the hands of US Customs and Border protection, all bets are off until it gets into the not-all-that reliable hands of the USPS. At least so I've been told.