For many (many) years I used pencil on my labels then I found this little piece of equipment on special offer.
I have the power adapter, which cost almost as much as the printer's offer price. It would be expensive to run on the batteries, it seems to have high power usage. I also use a compatible generic replacement tape, Black on Clear. These tapes when bought in number ( five at a time) cost under £3 each which includes the postage. That's quite a lot cheaper than the Brother brand. I just wouldn't go back to pencil now.
That the same model I run Fred, except I use batteries as I tend to use it outside, for which I used batteries from our local pound shop at just (funnily enough) 99p for 8 or sometimes 10 batteries it doesn't feel like I’m being mugged like it does when I buy 'proper' batteries. I have used the black lettering on white tape for a number of years, mainly because I had a largish quantity of black plant labels and black lettering on clear tape would have been silly even by my standards. Also the self adhesiveness of the labels is impressive, I have some plastic labels in the bogs outside, that have literally perished, broken and split from the ultra violet, which are held together just by the self adhesive Brother label and non of the lettering has faded either, I am impressed. I do have a bit of a problem with the length of the labels sometimes, but I have found some gigantic 10" long labels ones for plants with annoyingly complicated nomenclature. Out of interest how much was the mains adaptor? It sounds like something I should have.