I've no idea on where you can get maple grips for it, as the standard grips are walnut. If you do a google search for custom grip makers you may find one willing to make a pair for you.
http://www.gunpartscorp.com/ probably have original second hand grips, but you take a punt as to condition.
There are several online gun auction sites such as Guns America, Auction Arms, Arms Bid, etc that will usually have photos of what you are bidding on, so I would look there.
It's not a rare gun, as roughly a quarter million were made. Many however were nickeled, the barrel cut back and the cylinder bored out to take a .38 Special cartridge, which pretty much ruined their value to a collector or a shooter (.38 special has a narrower cartridge than .38 S&W so .38 special brass will crack or bulge when fired through one of these converted guns).
If it hasn't been refinished and is in excellent original condition (you will need original grips) then value may be as high as $350, but photos are required to confirm that. If it has been converted then $150. Not converted and externally worn but mechanically fine, then maybe $250.
To upload a pic:
Save a picture to your desk top.
hit reply.
click on 'Manage Attachments'
A new screen will open. There is a box that says 'Upload File From Your Computer'. Click on browse on the right side of the box.
This will open a new window called 'File Upload'.
Click on the desktop symbol on the left side of the box.
This will bring up the files on your desktop in the File Upload box.
Double click on the file name for your pic.
The file name will now appear in the dialog box of the Manage Attachments window.
Click on upload to the right of the dialog box.
The window will say Uploading File(s) Please Wait.
When it has finished loading there will be a new box in the manage attachments window that says current attachments. Your file name will be in it.
Click the Close This Window button at the bottom of the manage attachments screen.
The only screen open should be the reply to thread window.
Type your message.
Click Submit Reply.
You are done.
Sample photo is from the 1920s, the checkered grips you are looking fior are basically the same, but with a silver medallion in the circle at the top of the grips.