What is the difference if we say:
or without the 都 (i.e., 一点儿不贵)?
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To be honest, no difference at all. I know someone may try to explain their difference by the significance of 都. But no Chinese are willing to consider it before making use of it. They are both from spoken Chinese and consequently can not be used in some writing tasks. If it were me, I would use the former one. Because it sounds more casual and nature.
In here, 都 means "at all (compared with something similar)" - everybody understands that "Not expansive at all!" is a comparative term/speaking, the logic is clear.
Without it, the logic behind "Not expansive!" is unclear, thus it can be considered a local/personal informal expression, which shall be avoided either in writing or speaking.