comments:
https://www.amazon.com/InvisiLight-Fiber-Replacement-Spool-Adhesive/dp/B0GQ6K4D57/ is their actual replacement spool, but it's still expensive compared to the generic stuff. https://www.amazon.com/s?k=G657A2 will get you lots of length/connector options, or there's always AliExpress. I got 50m with LC ends and a pair of 10Gb bidi transceivers for a grand total of $34.11 after all the random AE discounts ($15.24 for the fiber and $18.87 for the SFPs).https://www.aliexpress.us/item/3256811669117910.htmlhttps://www.aliexpress.us/item/3256801714771843.html The specs that InvisiLight lists for their fiber are technically better than G.657.A2, but I'm not sure how accurate they actually are. The generic stuff seems pretty comparable for a fraction of the cost.
https://www.amazon.com/InvisiLight-Fiber-Replacement-Spool-Adhesive/dp/B0GQ6K4D57/ InvisiLight's actual fiber replacement part. I haven't seen this stuff in person, but maybe you could pull it off their spool and just run it like a regular string of fiber? Also, I saw some review comment about how he broke the fiber just as he was finishing the install, and he wasn't able to source replacement fiber. He mentioned an odd wavelength that didn't seem to match up with standard transceivers. I wonder if InvisiLight is actually different, or he just misunderstood something.