Our clients purchased these at a local hardware store a few summers ago. They are just standard bulbs. Target has had similar ones seasonally, which we personally have on our deck and have lasted many years.
You can source commercial versions you can purchase from an online supplier, often with more specific lengths and types of bulbs to suit different venues.
Not sure what your deck looks like, but we have a pretty neat selection of deck lights. We can even make some custom lights for you if you need. I'd be happy to help you find what you are looking for, even if it isn't mine.
For string lighting and a wide range of bulb styles (LED and incandescent) are available at www.partylights.com. We pride ourselves in customer service, so if you need help with deciding what's right for your space, give us a call.
KBC Developments
Moonlight Decks LLC
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Hometown Evolution Inc.