A $50 order has the $10 Shipping charge - works out at around £38 and incurs £12-14 Import VAT/Handling.
If you get hit, don't be surprised if you get an email from a company called 'Customs Clearance Ltd.' instead of a Post Office card - it's the handling company for fees and not a spoof or spam - at least in this area and they take PayPal. Watch your 'Junk' folder 7-10 days after the Hancocks shipping email in case! Your parcel is delivered a couple of days after payment.
Hancocks (link) has
loads of fabrics at $4.99-$6.99 and they have a lot of nice backing fabrics too
Their Customer Service is great too - I had a small hole in a backing fabric and sent them the photos. They replaced it without question