This site says they sell ribbonwood and manzanita for perches. Scroll down to see that part:
http://www.exoticwooddreams.com/catalog ... cpets.htmlManzanita seems to be easily available online. It's bird safe but it tends to be kind of slippery so you need to scuff up the bark so the surface isn't so smooth. Here's another site selling it specifically for birds:
http://www.manzanita.com/perches.htmHere's a site selling manzanita branches for crafts:
http://www.save-on-crafts.com/branches2.html Here's another manzanita site:
http://www.bloomsandbranches.com/Search ... p?Cat=1852It's hard to find other types, so if you want some other type of wood you'll need to be bold and seek them out in the real world. You could probably use your old perches temporarily in the new aviary if you do some adapting to make them fit. If nothing else you could suspend them from the ceiling like a swing using wire or rope to hold them up.
Are the birds not in a cage inside the garage? They'll be safer in one than flying around loose.