I have replaced roller unit before. Usually ACE hardware, lowes, or home depot may have the units that fits your sliding doors. It it was me I would first try to adjust them. The roller unit at the bottom usually has screw adjustment at the ends. To elevate the roller off the track. Over time it can weaking and collape and maybe height adjustment will work along with track cleaning.
Replacing roller unit assembly not that hard. Probably could watch UTube video on how to do it. If you just don't want to fool with it, then replacement and track cleaning should let them roll like new again.
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