If it is a gift: pick a grinder or a piece of glass over a novelty. Novelty gets one laugh. A good grinder gets used every day for years.
On grinders: four-stage or do not bother. The kief catcher is the entire reason to spend more than ten dollars on one.
If discretion matters: buy for the odor, not the look. Stash jars and bags is the section that solves it, and a plain bag beats a printed one anywhere outside your own home.
On glass: freezable and glycerin pieces are the upgrade people notice. They cool the smoke, and they are the ones that get handed round and asked about.
If you are shopping for a couple: stoner sex toys is where the two halves meet. A weed-themed vibrator costs roughly what a nice lighter does and gets a considerably better reaction.
Age verification applies on certain items.