I know there is a sticky for BV requests but I was experimenting the other day with the collections part of the Beckett online price guide.
If you start a collection in 'My Collections' seperate from anything else you may have there you can get the BV of any card.
All you need to do is find the card you want the value of, add it to your collection (needs to be the only card in your collection), then Beckett will give you the price value of your collection even if it consists of one card.
Next time you want a price delete the card in your new collection and add the next card you want the value of.
This may seem fiddly but if you need a price on the spot it is the best way of getting BV. Or you could subscibe I suppose.