A bottle washer that goes on the kitchen faucet is a good one if you bottle. Bottle tree & vinator save time & space. More plastic fermenters is always nice. A fermenting bucket lid openning tool will save sore fingers.,& a rubber mallet for snapping them down makes life a lil easier. I started saving 6-7 1 gallon spring water jugs from the grocery store where it costs 79c per gallon to go to Artisian Springs where I get fresh local spring water for 10c per gallon.
Some pint jars & a 1 gallon glass jar for washing yeast which will save another couple bucks per batch. Aquarium lift tube cleaning brushes for cleaning short tubes,bottling wands,spigots,etc.
I went to the dollar store & got spray bottles for starsan,mesuring spoons,funnels,& measuring cups that are always needed here & there. A large dual layer fine mesh strainer for straining chilled wort & top off water into the fermenter. Also,1 gallon SunnyD jugs. 1 measured off in quarts for measuring mash water ,etc. 2 more for PBW & starsan solutions. 1/2 gallon plastic vodka jugs for blow offs & cleaning my starsan solution with a funnel & coffee filters. An orange home depot bucket for draining PBW out of fermenters,delabeling bottles,etc. Everything works if ya let it!