Basically you need to be the article that the buyer is on when they reach the ZMOT (Zero Moment Of Truth). To do that you must be specific about the product; supportive to their choice; informative about the best place to buy; and, forceful in honing in on the sale. Add a buy button and a call to action so the buyer feels that it is time to purchase and not to prevaricate any longer.
They know they want it!
[By you]..They have been told that it is their best choice. They have been given the final information (your research) as to the best place to buy (at the best price; best after sales; best warranty; best .....). They have been given a single click option to go get it. They have been given the call to action ('Buy now in the sale at .....before the price goes up'). What would you do?