It will vary from place to place, and generally varies by how much they're being sold for!
A quick look at a supermarket price comparison site, and some quick calculations, gives the following
Tesco: £6.25/kg [£2.83/lb] = £85 for 30 lbs
Asda: £4.36/kg [£1.98/lb] = £60 for 30 lbs
Sainsbury's: £4.38/kg [£1.99/lb] = £60 for 30 lbs
So, in the UK; 30 lbs of strawberries cost an average of £68.
[$112 USD; $127 CAD]
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Unless you mean 30 Great British Pounds; which would mean that £30 of Strawberries cost.. £30. and for your price, you would get around 4.8kg, or 10.6 lbs.
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