Let me write a list of some usefull 'materials' what i use and can be bought by NPC or easy to collect.
wolf teeth: rank:20 type:hard tissue place:Southe Pole wolves
black jade: rank:25 type: jade place: Iceberg 3F easy to collect with an alt with vacuum cleaner.
purple jade: rank:18 type: jade place: Iceberg 3F easy to collect with an alt with vacuum cleaner.
sea armor: rank:18 type:steel place:Cairo
demon gloves: rank:18 type: leather place:Cairo
iron net boots: rank:17 type: iron place:Cairo
copper crest: rank:18 type: copper place:Cairo
wolf bracers: rank:18 type:titanium place: Bangkok
all Hawaiian item: rank:18 type: flower,grass,fur,feather,wood,nylon,gold,silver etc...
some manufactured item that usefull for compounds:
propeller rank20 wood
vertical wing rank21 wood
wooden pedals rank19 wood
airship steer rank16 aluminium
Hope this helped a lot, maybe there are some mistake you should check before going to make somehting. Anyway if u search up the item you can easily see what can u make from them.