Sterling would be the best but far from a smart business decision lol

Wood/bamboo would be cost effective. Metal logo'd spoons as an add on or giveaway or "1 spoon with 4 jars" type deal etc. May work. Laser engrave some Ikea spoons? Lol

Personally I dislike wooden spoons. Those little wooden ice cream spoons give my mouth a sort of PTSD. I think the kids today call it "the ick."