Hiya, and welcome to the community!
If you’re happy to manually scan the items as they move from one station to another, then RFID may be the simplest option. An RDIF sticker can be purchased for around one cent, well, more like a roll of 100 can be purchased for $1 last time I checked.
If you only have one or two workstations, then readers are available from around $5 to $20, and I’ve seen some advertised as cheaply as $2.50.
A camera tracking system, while automated and possibly reducing the need for manual scanning, may only be viable if you can find cheap, used webcams and something to plug them all in to.
Depending on your price range and what you’re doing, RFID may be the way to go.
If what you want is for the movement of items to be tracked without being scanned by an operator, then you may be interested in longer range RFID, but these readers can get a little costly.
For absolute positioning of items inside a room, then we’re talking about a local positioning system, and that’s a whole new can of worms.
Please let us know in more detail if any of these may seem suitable or if anything I’m saying sounds like it’d be helpful, and I can go into further detail and assist you more specifically.
(I’ve played around with RFID a fair bit before and am pretty familiar with its limits, what I’ve seen in some cases is someone put a large reader under their workbench to automatically scan any items they place on it)
What matters most is your intended application, as that’d probably give us a clearer indication of what may best suit you, but if you don’t want to go into further details on the specifics of your project that’s fine, we’ll help you the best we can anyway.
All the best, Ryan.