Where can I buy several of the ten 3mm torx screws that hold back pane

What model of the machine do you own? What I usually do for screws is if I have a part from a similar machine that is junk or leftover parts (Ex: BER due to multiple bent chassis parts, or a bent lower chassis with the screw needed) but I know the size is right, I’ll grab them from that - but that’s something I can do bc I have parts on hand or junk I can take stuff off of I’d otherwise be buying an assembly if I didn’t have it. If you think you have a match like that, look to see before buying anything.

A lot of the time, you can find screw sets for machines like this if you don’t have some from places like PartsPeople. Shipping tends to be high for what you get, so throw something else in you may want or need to do “while you’re there”, like a better wireless card. You may also find them on eBay, or a computer shop may be able to give you some for very little.