I picked up some High 5 IsoGels at IM Wales last year.. very liquid consistency. Their regular gels (i.e. non-"Iso") work well too and are less liquid, but not as thick as Gu etc.
Not sure if they're available in the US but a lot of the UK/Ireland-based web stores have them (CR seems to be the cheapest)
http://www.chainreactioncycles.com/...ml-x-25/rp-prod46348
https://www.probikekit.com/brands/high5.list
Not sure if they're available in the US but a lot of the UK/Ireland-based web stores have them (CR seems to be the cheapest)
http://www.chainreactioncycles.com/...ml-x-25/rp-prod46348
https://www.probikekit.com/brands/high5.list