I've just had a near miss with this, the foot I wanted they had but I couldn't make my mind up on a second one to get free delivery and just left it in the basket. I had been looking at at a few websites at the same time to weigh up price/delivery.
I've just received an email from Barnyarns with an invoice for the foot I wanted but I couldn't remember buying it. I got locked out of Paypal because the codes were coming too late because of poor mobile signals so couldn't see whether I had bought last night. Then another email came, I'd bought in April but it was on backorder
Didn't charge me delivery either.