They are pretty expensive at an ex vat price of £300. You probably already know this but there are lots of organisations including the RNIB who offer grants to help buy devices such as these. Once upon a time your local authority might have funded it, but those days are long gone.
If you're in the UK it's pamtrad.co.uk. Here's the link to the product page:
And here's the link to the manufacturer's product page which is based in Australia. I've had an email chat with the guy and he genuinely seems to be interested in making life better for blind people.
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