It's the thought that counts. Just don't procrastinate because of being unsure what to give them. Whatever you send, be sure that it includes a piece of paper with your handwriting on it and your personal "tone of voice" in the wording.
Actually, a Harry & David Fruit-of-the-Month club seems designed exactly for what you want to do... it's not too hard to rack up several hundred dollars' worth of gift, indeed I see the "original" Fruit-of-the-Month Club costs $317.50, and it's reasonably safe--no storage problem, it gets eaten, its pretty easy to bring to work and give away, etc. They have good quality control. The only real objection is that their fruit costs about 5-10 times as much as at the supermarket and it is good but it is NOT 5-10 times as good,
Annual income twenty pounds, annual expenditure nineteen nineteen and six, result happiness; Annual income twenty pounds, annual expenditure twenty pounds ought and six, result misery.