I went to a wedding last year and ordered this dress on Amazon: https://www.amazon.com/dp/B07433X955/ref=cm_sw_r_cp_apa_vDyMBbVZ91XE1

I didn't want to spend a ton of money on a dress that I'd probably only wear once and surprisingly the quality was nice and it fit well. The neckline isn't what you're looking for but I saw in the "Sponsored Items" and "Recommended Items" on this dress are a few that might fit the bill.