Sometimes people use Christmas outdoor lighted decorations for Halloween because they are versatile, like the white lights. However, it is quite tacky to use decorations like reindeer/Santas so I advise against that.
The Christmas Tree shop offers Christmas decorations year-round at very reasonable prices. Seasonally, you can find some great lighted decorations at places like Target and Walmart.
There are many outdoor lighted Christmas decorations available. Some include a Santa theme, but many incorporate other traditional Christmas images like stockings, Christmas trees, candy canes, snowflakes, angels, and nativities.
Lowe's does carry lighted decorations, but they focus mainly on outdoor decorations. If this is what you are looking for Lowe's should have a wide selection available for purchase.
Outdoor halloween decorations can be purchased in you home town. Places such as walmart and target offer great halloween decorations for all sorts of decoration ideas.
I like shopping at Kmart, Target, and Walmart for outdoor Christmas decorations. However, their stock may not be out yet. Check their online counterparts or Amazon for some ideas.
The use of outdoor flag decorations make the option of incorporating Christmas and Halloween decorations into one device. Simply change the flag to appropriate Holiday decoration. Seasonal colored lights are another way to celebrate multiple holidays with the same decorations.
Whenever I'm doing design work I like to use Google images. Go on the Google home page and click on images and enter Christmas lighting and decorations.
Christmas lights can varie in price depending on style. Led lights are the most expensive but can save on your utlitiy bill in the long run.
There are many places to look when purchasing outdoor halloween decorations. There are local halloween specialty stores, wal mart, target, hobby lobby, joann, michaels, and many more.
you can purchase outdoor christmas decorations, for the lowest prices at walmart. they have outdoor decor, inflatable decor, and any decoratio you are lookin gfor.
To find the best Christmas outdoor lighting for your needs, you will find the best selection at http://www.theholidaylightstore.com/store/cart.php. Their knowledgeable staff will answer your questions, and even schedule an appointment to help assist your set-up.
You could use white lights for both, though better choices would be orange and black for Halloween - white would be okay. You could create a Scarecrow for Halloween, then dress him as Santa for Christmas. That would be creative.