Honestly, I spent way too much time over the years worrying about my gear failing, and i've tried basically every brand under the sun. For your $80 budget, you are actually in a really good spot. You dont need to buy the official Canon one if you're just doing this for a wedding, but definitely stay away from those $25 ones that look like they're made of recycled milk jugs. In my experience, the Vello BG-C18 Battery Grip for Canon 90D is the best middle ground. Its usually around sixty bucks. I have used Vello grips on multiple Canon bodies and they never let me down or caused any weird electrical errors. The buttons feel clicky enough and the build is solid. It feels much more secure than the bottom-barrel stuff you see on some sites. Since you'll have about $20 left over, you should really grab a backup battery too. A grip is useless if you only have one battery to put inside it... lol. Check out the Wasabi Power Battery for Canon LP-E6N. They're super reliable for the price and will easily get you through the reception without your camera dying. Just make sure you charge everything the night before. San Diego is beautiful for weddings, you're gonna have a blast!

Look, I totally get the stress. I remember back when I first started doing events, I bought one of those generic no-name grips from Amazon for like twenty bucks because I was broke. Honestly? It was a disaster. The shutter button felt like mush and it actually drained my batteries faster while the camera was turned off. Super disappointing experience. You definitely want that extra juice for a wedding though, especially since the 90D eats through power if you're using live view or video. The official Canon BG-E14 Battery Grip for EOS 70D 80D 90D is definitely the gold standard but yeah, its way overpriced for a piece of plastic. Since you're on a budget, I'd suggest looking at the Vello BG-C10 Battery Grip for Canon 70D 80D 90D. It usually sits right around your 80 dollar mark and the build quality is way better than the bottom-of-the-barrel stuff. It basically lets you slot in two Canon LP-E6N Lithium-Ion Battery packs so you double your shooting time. Plus it gives you a vertical shutter button which makes those portrait shots way easier on your wrists. Just stay away from those cheap ones... I've seen them literally lose connection mid-shoot and its just not worth the risk for a wedding. I learned that the hard way when a grip failed during a ceremony and I missed the kiss because the camera wouldnt power on. Super frustrating.