Affordable USB Flash Drive Compatible with Mac and PC for Photos and Files

I am looking for what I believe used to be called a memory stick, a little gizmo that you push into a USB port on a computer and it will record pictures, text, whatever you want to put into it. What I am seeking has to work equally well with a Mac as with a PC.   Another stipulation is that I don't want to pay a lot of money for it. Is there such a thing, does anyone know, please?Michelle O'Brien

I think these things are called FLASH DRIVES these days.
Michelle

They are also called USB sticks or USB Flash drives. 
Where I live, you can get them just about anywhere you can buy electronics devices and/or computer accessories.  I can usually find the smaller memory capacity ones for less than $10 each. They start to get expensive if you need something more than 32G.
I think they all work on both Mac and PC but can't say for sure as I only have a PC.

USB memory sticks and USB flash drives tend to work on Windows PCs, Apple Macintoshes, and Linux machines, because the interface specification for USB disk drives is part of the USB 2.0 standard. Some USB memory sticks come with Windows software preinstalled on the USB memory stick, so you may want to find out how to prevent Windows from automatically installing and running this software.

Das ist gut! C'est fantastique!Sorry, couldn't resist such a reply to your classic title
My only real comment to add to the above are that not all manufacturers are equal. You get what you pay for. You won't have much bother with known names but if buying from eBay or the like from unknown sources expect to find the connections being "iffy". They could work in one machine but not in another irrespective of OS. If the data is valuable buy from known brands.
I haven't had much trouble swapping between Windows and Linux (usually Red Hat) but on occasion the Linux machine needed to be rebooted to "see" the drive. Always "eject" properly before removing the drive. On the rare times I have interacted with Apple I had little problem (well with the flash drive anyway) but with that too, remember to eject correctly.Some drives are marketed as a "locker" to keep your data secure and include inbuilt encryption that autoruns on insertion. Avoid those unless really needed.I have a 4GB drive from about a decade ago, when that was considered large. That has been in dozens of Windows / Linux boxes all over the place and is stuffed full of all sorts of things. Never let me down yet.
Now you have "Reasons to be Cheerful Part-3" ......  "What a waste" for those unaware of significance
Regards