Actually, it really depends where you live. Around my area there is a doors and window store where they have a huge variety. You can always visit a furniture store to see if they have any doors.
You can find new entry doors at your local home improvement store. Lowes and Home Depot both have a large variety to select from. Ace Hardware may also have a small selection to choose from.
You can purchase hardwood doors at your local Lowe's home improvement store. You can also purchase one online from websites such as Simpson Door, Solid Hardwood Doors, and Doors 4 Home.
There are many places where one can purchase reclaimed oak doors. Try a local hardware shop that provides them. Menards has many different doors to choose from and there may be some reclaimed oak doors there.
You can purchase curtains for patio doors at your local Sears or Lowe's retail store. You can also purchase some online from the Amazon website and have them shipped directly to your house.
One can purchase aluminum doors from the local construction dealers nearest to their place. Alternatively, one can purchase it from online stores such as Aluminum Joinery Wellington and Online windows.
You can purchase closet doors at any local hardware store such as home depot or lowes. That is unfortunate this happened so soon to you moving in to a new house.
You can purchase a no entry sign from a variety of locations. You can try your local sign and printing store, a large stationary store or you can try online on Amazon or eBay.
One can purchase roll up doors from any local construction or hardware retailers. Alternatively, one can purchase it from online stores like eBay and Amazon.
One can purchase solid wood doors from local home improvement stores where one can choose the colour and type of wood used. One may also find a solid door at local furniture stores.
You can purchase replacement doors for a cabinet at your local Lowe's home improvement store. You can also purchase one online from the Amazon website and have it shipped to your house.
Unless you are very familiar with garage doors, it may be wise to first do some online research to find out what type of doors are available. You can also find information there about where to purchase the doors (local retailers, online distributors, catalogs).
Most large hardware stores sell garage doors such as Home Depot and Lowe's. There are also many smaller local companies that specialize in only selling and installing garage doors. They usually advertise in the local newspaper or are listed in the Yellow Pages