Home Depot
Lowe's or Home Depot are a pretty good bet for items of that nature. Both offer a loyalty program that you can sign up for in a few minutes online. Never can tell when you'll need a discount at the hardware store, but it comes in handy.
For door handles and keys I'd go to Lowe's habor freight has a few selections but Lowe's and home depot have a bigger choice
Or if a cheap one can be used, you can goto the 99cent store off of tropicana and nellis blvd, and they have them for like $5.99 or so!
Home Depot or Lowe's
For keyed door handles you should go to a hardware store
Maybe you can find,they have a website you can search online, and then decide if go or not.
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