I strongly urge you not to go down this path your friend is suggesting. I understand your grief; my own wife died less than a year ago, and I miss her very much. But don't be misled; this is not the way you should go.
Why do I say this? One reason is because much of what passes for psychic activity is actually fraudulent (as study after study has shown). In other words, you would only be wasting your money, and ending up with an experience that had no reality behind it. You would constantly be looking for something greater - but never finding it.
But the other reason I urge you not to go down this path is because it could bring you under the influence of spiritual powers that are hostile to God, and that would turn you away from Him. This is why the Bible commands us not to have anything to do with occult powers: "Let no one be found among you who ... is a medium or spiritist or who consults the dead" (Deuteronomy 18:10-11).
Instead I urge you to open your heart and life to Christ, and to find your hope and comfort in Him. He alone offers us the hope of eternal life, for He alone has conquered sin and death and hell by His resurrection from the dead. God loves you, and if your husband could speak to you right now, he would urge you to give your life to Christ without delay.