We just moved into a place without a washer/dryer. It was looking like $900-1200 was the cheapest new option we'd be looking at new. Maybe a little less from a scratch and dent, but that's kind of hit or miss since you've just got to wait for something you're interested in to get scratched or dented.
I cruised Craigslist for a bit and reached out to a few, but didn't really hear back from many. I think there may have been some screaming deals (like $200 for the set) if we waited. I was also a little concerned about going into people's houses with the pandemic, and it seemed like a lot of the options were no longer installed, so no way to confirm they actually work. Since we don't have a truck, renting one was looking like $75 or so between the base charge, mileage, and insurance Uhaul's aren't covered by your car insurance), so that added to the cost.
We ended up buying a "set" for $500 from a used appliance place figuring we should at least have some recourse if it didn't work when we got it home. They also offered delivery (free within 10 miles, for a charge beyond that), and claimed a 30 day repair or replace (with another set -- no refunds) warranty and a lifetime labor, but we haven't tested those claims. The "set" we bought don't actually match (same brand, but different models), which definitely seemed to make it easier, so I would suggest not worrying about making them match. Selection wasn't great, so it was pretty much a few options to choose from or wait for them to fix up more. Definitely stick your head in them and smell. We nixed one set because the washer smelled like a wet dog. We checked out two places, both found by searching "used appliances" on google maps and looking at the reviews. The one we went with had better prices
Our electric dryer came with a cord (note that some houses have 4 prongs and some 3 prongs, so take a picture of your outlet or just remember it in case your store will give you one), but I'm not sure they always do, so factor that in. I don't think washer's ever come with hoses (maybe if you buy used from an individual, but I'd probably still replace them). We bought
this pair from Home Depot for $20. You might save a few bucks with rubber hoses, but I'd just spend the extra $5 for braided. You might need the dryer vent hose and clamp things (not sure what they're called, I can find a link if needed), but our place already had them.
Install was easy enough. The delivery people weren't going in the house (which I totally understand and probably would have preferred anyway), so if that's the case for you'll definitely want something wheeled (we used a 4 wheeled furniture dolly we have, but the two wheeled kind with the handle would be easier). A strong helper would have been nice, but I managed with my wife only able to pull the dolly out from under. You'll need to get behind the dryer to attach the vent, so account for that, but the washer will be heavier, so I'd install that first unless it will mean you can't squeeze behind the dryer.
Our place had thread seal tape on the water outlets, but I asked the guy repair guy at the used appliance place and he said that was more likely to get mess up the seal with the rubber washer than to help, so I took it off and didn't replace. Read the instructions on the washer hoses and don't over tighten -- hand tight plus 1/4 turn (I used vice grips properly adjusted to not over-clamp, but any pliers or just strong hands would probably do the trick). We ran and empty load with bleach, checked the water hoses and drain hose for leaks and all was good
I'm not sure I'd want to hook up a gas dryer, but if you take your time and watch Youtube videos I'm sure it's doable. Make sure you follow instructions on checking the gas lines for leaks (probably soapy water and look for bubbles).