Depending on the area you might have limited dispensary options, the big cities in Oregon have tons of dispensaries but smaller towns usually have like 1 or none. I’d recommend going shopping in one of the cities so you have more variety to choose from.
Also I’d recommend buying a cheap silicone bong. They’re indestructible so you won’t have to be so careful with them or go through any heartbreak if a drop occurs; perfect for just focusing on the smoking and fun parts of your trip.