Oct 31 is a Holiday, Halloween, so that date would likely be busier at Disneyland. It would also be a Mickey's Halloween Party nite so you would need to purchase a Party ticket along with your regular day ticket if you wanted to stay later than the early closing at 5pm for regular guests.
Or you could just purchase a Mickey's Halloween Party ticket and dont come into visit Disneyland till 3pm since they allow you into Disneyland a few Hours before the Party starts. Closing for the Party is 11pm and the MHP only ticket is less expensive than a regular 1 day Disneyland ticket.
If you want less crowds, Nov 1 would be alot lighter crowdwise, however, hours would be shorter likely 10am till 8pm with no Fireworks or Fantasmic on that night.
Here is a Map of Hotels in the Disneyland area so you can see where things are located, the Disneyland Main Entrance is off of Harbor Blvd near where it says "East Shuttle Area" on the Map
Or you can stay farther away and take the Art Shuttle which goes from Disneyland to alot of area Hotels multiple times per day for a small fee per person.
If you have some forum of AAA where you live, that is usually honored at most Hotels and can give you a good discount.
Some well rated places that should be in the $100 price range.
The Best Western Park Place Inn...... a standard Motel has a good "no Car" discount as well as AAA, its a short 5 min walk total to the Turnstiles that go into Disneyland Park ( they often dont show availability on thier website, but do when you call them direct)
Anaheim Desert Inn, a standard Motel ..... is also a standard Motel about a 7 min walk.
Best Western Anaheim Inn....a standard Motel . is about an 8 min walk.
Farther walking distance would be the Alpine Inn........ a standard Motel about a 14 min walk, with Art Shuttle service..
Red Lion.........which is a Hotel, is about a 15 min walk with Art Shuttle service.
is having a good "Carsland" special right now at $99 a night with free parking and free breakfast for 2 adults.
Peacock suites....... is also a Hotel, but is about a 20 min walk with Art Shuttle service.
Since Oct 31 is a Holiday, if you want to book something well rated for that night, you should do that ASAP with a cancelable reservation as thats a popular time to visit Disneyland. Then you could keep looking around for something better.