toner cartridges last for years. The model I bought takes the same range of carts as some of their office machines, and I bought a few on ebay from someone whose company was clearing out their stationery store. They are date expired now but last time I changed one it worked fine. The powder can't dry out or harden in storage like ink might. It looks like mine retail at £48, the assembly includes a new transfer roller. Some of them look more expensive but are actually multipacks, say five carts for £150.
The cartridges might have a nominal life of 2,000 or 1200 pages.
The drum might last 10,000 or 20,000. You can reset the counter, but a new one can cost a lot. They vary. I have reset mine.
It is possible to fill them up with new powder, which I have done in the past. You just need a funnel. I don't suppose the makers encourage it. They probably buy the powder at 50p a ton. Heaps of bargains on ebay, including "refilled" for a tenner, but in my case no need.
I had a look on my suppliers website, they have other packs much more expensive, presumably intended for big office colour machines.
I just looked at the Samsung section and they are a similar price range, but you need to search by part number according to the fit of your printer.
https://www.novatech.co.uk/search.html?s=printer cartridge&c=1129,&m=89,&o=1
The laser printer is so fast and cheap to run, for text, that mine is constantly connected and on standby. So if it was me, I would have a laser, with a colour MFP to throw away when it went wrong.
Looking at the pictures, the Samsung M2835DW is probably equivalent to mine.