For the record, these are actually clones of the legacy Everdrive GB, which predates the X series. The X5 uses PSRAM rather than flash for much faster ROM loading and is also much more power efficient.I prefer the EDGB on AliExpress. It's about $25 to $30 on average, between sellers. But it's an Everdrive GB X5 hardware clone that's really good quality. Much better than the EZ-Flash Jr, and it's half the price. (And obviously significantly cheaper than a REAL Everdrive GB X5).
The EDGB clones on Ali are respectable carts though.