Here's a list of some GPUs that had 8GB of VRAM
R9 390 - 2015, $330
R9 390X - 2015, $430
RX 480 - 2016, $240
RX 580 - 2017, $230
RX 590 - 2018 - $280
RX 5500 XT - 2019, $200
RX 5700 - 2019, $350
RX 5700 XT - 2019, $400
GTX 1070 - 2016, $380
RTX 2060 Super - 2019, $400