Wedding dress

Hello all. I'm in a bit of a bind.

My wedding is next month and I had picked out a dress but it's shipping from China and now might not be arriving at all (I'm in the U.S.) so now I'm low on time and need to find a new dress. I was hoping y'all could help me find an online platform where I could get a dress for below $300 USD. It would need to be plus sized; I'm not sure if that affects anything but wanted to include just in case. TYIA