Generally if a bargain is too good to be true it's a safe assumption that whatever it is is no bargain at all, but not always...
Back when the Olympus OM-D E-M1 was released for pre-orders there was a brief window of a couple of days when the Jessops
website had the E-M1 plus its high end 12-40mm f/2.8 "kit" lens advertised for £1299 instead of the expected £1949. Normally that would scare me off but Jessops always had a good reputation here in the UK so, despite it's financial troubles earlier in the year, I decided to click on the order button. I'm sorry not to have shared the bargain price more widely on the forum (I did share via private communication) but I judged that too great a demand at such a discount would have forced Jessops to cancel all orders.
Within 24 hours of the pre-order I had a phone call from Jessops who wanted to confirm the credit card details, something they did again the day before shipment, and both times I was expecting them to cancel but they honoured the price so this was one time when a bargain that seemed to good to be true was as good as it seemed and I tip my hat to Jessops for letting the order go through.
I'll sound one note of caution here. If you don't know the company you are about to share your credit card details with then be extremely careful. Even if you do recognise the name it is wise to do some checking as there have been a number of instances over the years where companies, often hosted on far eastern servers, purport to be local and either ship the wrong items or ship nothing at all. Your credit card company may offer protection from fraud but that protection certainly won't apply if you pay by wire transfer or similar. OK, that's teaching Granny to suck eggs for most but I thought it worth saying. The hunter in us can induce tunnel vision when in pursuit of a bargain and judgement sometimes goes out of the window.