If it is a gift: buy the kit, not the single toy. A vibrator in a stash tin reads as a present. The same vibrator in a plain box reads as something you had lying around.
If you want it to get used rather than displayed: buy for the shape, not the print. A cannabis print on a good stroker is a good stroker. A bud silhouette changes how the toy feels, which is a real decision rather than a cosmetic one.
If you are new to the category: start with a cream and toy kit or a bullet. Both land under the price where a themed purchase has to be justified, and bullet vibrators is where to look if the theme turns out not to matter to you.
On material: silicone for anything internal. A themed category mixes body-safe silicone with cheaper novelty plastic more than a plain one does, and the material line on the product page is the check.
If you want the theme without the toy: the 420 shop has the grinders, glass and stash gear, and smoking accessories covers the rest.