We believe we have the best quality bolt and bracket systems for the price anywhere to be found, but know you can find that out for yourself.
A simple search for treehouse attachment bolts other than Garnier Limb® returns some interesting results, the best are presented here to save you some time.
Though not all may directly provide artificial tree limbs themselves, these are some resources we think you can trust:
Treehouseworkshop.com
TheTreehouseGuide.com/links-builders.htm
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TreetopBuilders.net TreehouseSupplies.com
PeacemakerTreehouses.com
For an excellent 2008 article on GL installation by John Carberry: click here
Not devoted to treehouses in particular, but a great resource for alternative and sustainable builders of all kinds:
Precision Structural Engineering Inc.